Question

Module 2B: Velocity and Acceleration 4. A car travels up a hill at a constant speed of 40 km/h and returns down the hill at a constant speed of 60 km/h. (a) The displacement for the round trip is Hint: Ar ? (b) The average velocity for the round trip is Hint: Ar (c) The average speed for the round trip skm/h km/h At average speed -total distacekm/h total time Assume the distance for one way is d, t d/40, and d 60 Joyce Jeong spring-2019 Moduke 2 Homework / 3 5. The coordinate of a particle in meters is given by xt) 16t-3.0r, where the time t is in seconds. For t0 (a) will the particle be momentarily at rest? When? (b) What is the speed of the particle at t 2.0s The position of an object moving along a straight line is given by xe)--30, +2.0,,1 0, where x is in mcters, t 20, tis in seconds. (a) The average acceleration between 1 0 and Hint:A 6. 4.0s is Ar (b) The instantancous acecleration at 0sis Hintaal)- dr dr Why? e Is this partiele moving with a constant accelerat ts a -h- constant? Module 2C: Constant Acceleratio . What is its of +3.2 ms'. At a certain instant its velocity is +96 /s An clectron has a constant velocity (a) 2.5 s earlier and (b) 2.5 s later? Hint: Draw a single axis diagram, set up coordina (i) The rule of thumb is to choose the initial motion direction as Given 7. +x. Selec t two points as the initial and finul single axis diagram, set up coordinate, and label the given and known quantities as tormulas. Write down all three fornalas and check oflf the ones that you koow (ii) Use constant

question 5

Answer 1

dr 2