A 30 kg mass falls from a height of 4.0 m. What is the momentum of the mass just before it hits the ground? (265.6 kg m/s) If the kinetic energy of a ball is doubled, what happens to the momentum of the ball? (1.41 times larger) A 4.0 kg ball is traveling at 5.0 m/s and strikes a wall. The 4.0 kg ball bounces off the wall with a velocity of 4.0 m/s. What is the change in momentum of the ball? (36 kg m/s) Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball? (60 N) A 4.0 kg ball is moving at 3.0 m/s to the NORTH and a 5.0 kg ball is moving at 2.0 m/s to the NORTHWEST. What is the total momentum of the system? (20.3 kg m/s at an angle of 69.7 degrees NORTH of WEST)