Please fully explain.

I would love to hear your insights on this and would really like to understand fully, so please explain.

Thank you very very very much

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.

• • What is the momentum of the girl as she is diving?
  • What is the momentum of raft as the girl is diving?
  • 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. What is a neutrino? Explain how the Laws of Conservation of Energy and Momentum were used to predict its existence and properties.