1. What is the momentum of a 65 kg boy running 2.5 m/s?

2. What is the impulse of a 37.0 N force that acts on an object for 0.80 sec?

3.A baseball with a mass of 5.2 kg is dropped onto the ground with a 2.7 m/s and at impact has a speed of 3.6 m/s? What is the force after 1.2 s?

4.A 53.2 kg swimmer is standing on a stationary 170 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of 4.6 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and resistance due to the water.

5.A 31.0 kg swimmer runs with a horizontal velocity of 4.10 m/s off a boat dock into a stationary 8.0 kg rubber raft. Find the velocity that the swimmer and raft would have after the impact, if there were no friction and air resistance due to the water.

6.A 56 kg ice skater is traveling at 4.0 m/s to the north meets and joins hands with a 65 kg skater traveling at 12.0 m/s in the opposite direction. Without rotation, the two skaters continue skating together with joined hands. What is the final velocity of the two skaters and what is the decrease in kinetic energy during the collision?

7.Two skaters are facing each other on a frictionless ice. Aly has a mass of 47 kg and Dave has a mass of 75 kg. They push off from each other and Aly moves off at a speed of 2.7 m/s. What is Dave's speed?