[SOLVED] Change in linear Momentum(rebound)? A superball with a mass of 84.1 g is dropped from a height of 3.6 m. It rebounds to a height of 2.9 m. The acceleration of gravity is 9.8 m/s^2. What is the change in its linear momentum during the collision with the floor? Answer in units of kg m/s. I got no idea how to attack this problem.