An arrow is accelerated out of a bow. What is the average force exerted on a 0.15 kg arrow if it is accelerated to a speed of 110 m/s in a time of 5 ms?

A 0.11 kg apple falls off a tree branch that is 2.2 m above the thick grass. The apple sins 0.065 m into the grass while stopping. Determine the average contact force that the grass alone exerts on the apple while stopping it. Ignore air resistance.

A 31.0-kg skateboarder rides on a 10.0-kg skateboard at 5.7 m/s on a level road before jumping into air with a speed of 10.0 m/s against the ground in the direction of 27.0◦ above the forward, horizontal direction to leave the skateboard. Ignore air resistance and the friction between the road and skateboard.   What is the maximum height that the skateboarder can reach? (A) 1.05 m; (B) 1.25 m; (C) 1.45 m; (D) 1.65 m; (E) 1.85 m.   What is the speed of the skateboard on the ground after the jump? (A) 3.85 m/s; (B) 4.05 m/s; (C) 4.25 m/s; (D) 4.45 m/s; (E) 4.65 m/s.   What is the minimum work done by the skateboarder to make the jump? (A) 994J; (B) 974J; (C) 954J; (D) 934J; (E) 914J.

how long does it take a 2500 kg car to slow down from 15 m/s if it strikes a wall with a force of 10,000 N assuming that the wall is elastic?