Question

Hi I need help with the following problems:

1.A ball is thrown horizontally from the roof of a building 45.0 m tall and lands 24.0 m from the base. What was the ball’s initial speed?

2.A football is kicked at ground level with a speed of at an angle of 36.9º to the horizontal. How much later does it hit the ground? How height does it rise? What is its range?

3.A projectile is fired with an initial speed of at an angle of 30º above the horizontal on a long flat firing range. Determine (a) the maximum height reached by the projectile, (b) the total time in the air, (c) the total horizontal distance covered (that is, the range), and (d) the velocity of the projectile 1.50 s after firing.

4.What average force is required to stop an 1100-kg car in 10.0 s if the car is traveling at 108km/h? How far would the car traveled during those 10s?

5.A force of 48.0 N is required to start a 5.0-kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 48.0-N force continues, the box accelerates at What is the coefficient of kinetic friction?

6.A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.20 and the push imparts an initial speed of

Answer 1

Answer 2