A 10 kg ball moving at 5 m/s collides elastically with a stationary 2 kg ball. After the collision , the 10 kg ball is moving at 1 m/s in the same direction. What is the velocity of the 2 kg ball?

Answer 1

momentum is conserved

10 kg * 5 m/s = (10 kg * 1 m/s) + (2 kg * v m/s)

solve for v