1. A 60.0 kg girl stands up on a stationary floating raft and decides to go into shore. She dives off the 180 kg floating raft with a velocity of 4.0 m/s [W]. Ignore the substantial friction real objects in water experience.

a) What is the momentum of the girl as she is diving?

b) What is the momentum of raft as the girl is diving?

c) What is the final speed of the raft just after the girl dives?

2. A child throws a snowball at a tree and it sticks to the tree. Does this motion defy the Law of Conservation of Momentum? Explain.

3. Throughout history, many scientists have tried and failed to develop a perpetual motion machine. Find at least two examples of proposed perpetual motion machines stating when, where, and by whom they were developed. Use your knowledge of the Laws of Conservation of Energy and Momentum to explain why the development of a perpetual motion machine is impossible.

4. What is a neutrino? Explain how the Laws of Conservation of Energy and Momentum were used to predict its existence and properties.