Question

        1.       Which object has the highest KE? (provide all answers), state which one.

1. A 3kg ball thrown at 6m/s
2. A 5kg mass moving at 5m/s
3. A 80kg solid tray sliding across a desk at 0.4m/s                           [3 pts.]

2. A 2kg billiard ball moving at 4 m/s to the right hits an 8kg bowling ball originally at rest. The billiard ball then moves in the opposite direction at

2 m/s.

The collision is elastic. That is, energy is conserved. What is the velocity of the bowling ball after the collision?                                                               [2 pt.]     

Answer 1