1. A 2.00-kg is released from rest at a height of 20.0m. Ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights: 20.0, 10.0, and 0.0 m.

2. A volleyball is spiked so that it's incoming velocity of +4.0 m/s is changed to an outgoing velocity of -21m/s. The mass of the velocity is 0.35kg. What impulse does the player apply to the ball?

3. A car (mass=1100kg) is travelling at 32 m/s when it collides head-on with a sport utility vehicle (mass=2500kg) traveling in the opposite direction. In the collision, the two vehicles come to a halt. At what speed was the sport utility vehicle traveling?