Homework # 29 - Impulse and Momentum Handout Problems: 1. In a collision, a car is brought to a stop in 2 s. In a second collision, a similar car moving at the same speed is brought to a stop in 4 s. Compare the forces which act upon these two cars during the collisions. 2. Explain why it is dangerous for a person to jump from a 5-m height to a concrete sidewalk while it is quite safe to jump from the same height into a pile of hay. 3. A braking force is applied to a 300-kg motorcycle to reduce its speed from 20.0 m/s to 16.0 m/s in 10.0 s. Find (a) the initial momentum of the motorcycle; (b) the final momentum; (c) the braking force. 4. How long must a 50-N force act on a 400-kg cart to raise its speed from 10 m/s to 12 m/s? 5. A ball of mass 0.20 kg is pitched to the batter at 30 m/s and hit back by the batter at 20 m/s. If the ball and bat were in contact for 0.025 s, what force was exerted by the bat on the ball