Question: You have an inertia of 52 kg and are standing at rest on an iced-over pond in your skates. Suddenly, your 60-kg brother skates in from the right with x component of velocity -4.9 m/s and collides elastically with you.
1. What is the siblings' relative speed after the collision?
2. If your brother's final x component of velocity is -0.35 m/s , what is your final velocity?
3. What is the change in kinetic energy of the system of you and your brother?