Question

whats the answer and explanation?

Programming 2 16. Write a program that reads in a set of starting positions, velocities, and angles of a projectile. It then determines if the projectile hits a target a distance d away using the range equation v sin(202 where R is the distance the projectile travels, v is its starting velocity, is the starting angle, and 9 9.8 m/s is the acceleration due to gravity. Unit analysis is not necessary for this exercise, but you may assume all units Are in meters and seconds. The following is a sample file projectiles.txt 0 3 30 03 45 1 4 30 24 45 The first number is the starting position, the second is the velocity, and the third in the angle. All values are integers.

Answer 1

#CODE IN PYTHON

Hi There,

I am providing the code in Python and pictures to explain the question!

> the python file and the text file should be in the same folder

> Below is the code in which explanation is provided with the help of comments

import math
def distance(s,v,a):
pos=s
vel=v
vel=v**2 # Eg 3*3=9
angle=a
angle=2*a*0.0174533
angle=math.sin(angle) # Eg sin(angle)
d=0
d=(vel*angle)/9.8 # Projectile distance R is being calculated and returned
return d

a=[]
f = open("projectiles.txt", "r") # File projectiles.txt is opened
for x in f: #File is read line by line Eg 0 3 30
a=[]
d=0
a=x.split() # Line elements are splitted and stored in the list a Eg a=['0','3','30']
d=distance(int(a[0]),int(a[1]),float(a[2])) # Distance function is called Eg d=distance(0,3,30)

# Printing the values
print("for starting position: "+a[0]+",m velocity: "+a[1]+",m/s and angle: "+a[2])
print("projectile hits a target distance "+str(d)+"m away from the point "+a[0]+"m")
print()

> Now the image of a text file named projectiles.txt is provided

> Code image is provided in reference to the second image

> Output of the code is provided in the reference to the third image

TEXT FILE:

Help projectiles.txt - Notepad File Edit Format View 0 3 30 0 3 45 1 4 30 2.4 45

PROGRAM:

import math def distance (s,v,a): pos=s vel=v vel=v**2 angle-a angle=2*a*0.0174533 angle-math.sin(angle) d=0 d=(vel*angle) /9.8 return d #projectile distance R is being calculated and returned a=[] f = open("projectiles.txt", "r") #file projectiles.txt is opened for x in f: #File is read line by line a=[] d=0 a=x.split() #line elements are splitted and stored in the list a d=distance (int(a[0]), int(a[1]), float(a[2])) #distance function is called print("for starting position: "+a[0] +",m velocity: "+a[1]+", m/s and angle: "+a[2]) print("projectile hits a target distance "+str(d)+"m away from the point "+a[0] + "m") print ()

OUTPUT:

0.8660256281860526 for starting position: 0,m velocity: 3, m/s and angle: 30 projectile hits a target distance 0.7953296585382115m away from the point Om 0.9999999999997734 for starting position: 0,m velocity: 3, m/s and angle: 45 projectile hits a target distance 0.9183673469385674m away from the point Om 16 0.8660256281860526 for starting position: 1,m velocity: 4, m/s and angle: 30 projectile hits a target distance 1.4139193929568203m away from the point im 16 0.9999999999997734 for starting position: 2,m velocity: 4, m/s and angle: 45 projectile hits a target distance 1.6326530612241197m away from the point 2m

I hope it will help you! For any queries do reach out to me in the comment section!

-----------------------------------------------------------------------------------------------------------------------------------------------------------

# CODE IN JAVA

Hi There,

> Below I am providing the code in java too! as mentioned afterward.

CODE:

package extra;
import java.io.File;
import java.util.*;
import java.lang.Exception;
import java.lang.Math;

public class Extra {
public static double calculate(int v, int a)
{
double d;
double velocity=Math.pow(v,2);
double angle=2*a*0.0174533;
angle=Math.sin(angle);
d=(velocity*angle)/9.8; //Calculation of the distance
return d;
}
public static void main(String[] args) throws Exception
{
String token;
double x;
int a1,a2;
File file = new File("C:\\Users\\HP-PC\\Desktop\\projectiles.txt"); //file is opened
Scanner sc = new Scanner(file);
List<String> temps = new ArrayList<String>();
while (sc.hasNextLine())
{
token=sc.nextLine();
temps.add(token); //lines from text file are added to the arraylist
}
String[] tempsArray = temps.toArray(new String[0]); //Arraylist is converted to array

for (String s : tempsArray) {
System.out.println(s);
a1=Character.getNumericValue(s.charAt(2)); //Extracting velocity
a2=Integer.parseInt(s.substring(4,6)); //Extracting Angle
x=calculate(a1,a2); //Function called
System.out.print("Distance: ");
System.out.println(x);
}
}     
}

OOW - Start Page x Extra.java x Source History . QEEQT B package extra; 2 O import java.io.File; import java.util.*; import java.lang. Exception; import java.lang.Math; * @author LEO public class Extra { public static double calculate(int v, int a) 13 double d; double velocity=Math.pov (v, 2) || double angle=2*a*0.0174533; angle=Math.sin(angle); d= (velocity*angle)/9.8; return d; public static void main(String[] args) throws Exception String token; double x; int al, a2; File file = new File("C:\\Users\\HP-PC\\Desktop\\projectiles.txt"); Scanner sc = new Scanner (file); List<String> temps = new ArrayList<String>(); while (sc.hasNextLine())

Start Page > Extra.java * Source History C -Q25ECT D O O " 22 D String token; double x; int al, a2; File file = new File("C:\\Users\\HP-PC\\Desktop\\projectiles.txt"); Scanner sc = new Scanner (file); List<String> temps = new ArrayList<String>(); while (sc. hasNextLine()) token=sc.nextLine(); temps.add(token); String[] tempsArray = temps.toArray (new String[0]); for (Strings : tempsArray) { System.out.println(s); al=Character.getNumericValue (s.charAt(2)); a2=Integer.parseInt(s.substring(4,6)); x=calculate (al, a2); System.out.print("Distance: "); System.out.println(x);

OUTPUT:

Output - Extra (run) x run: 0 3 30 Distance: 0.7953296585382115 0 3 45 Distance: 0.9183673469385674 1 4 30 Distance: 1.4139193929568203 2 4 45 Distance: 1.6326530612241197 BUILD SUCCESSFUL (total time: 0 seconds)

Hope that it will help you!