Question

A 5 kg ball is moving 4m/s to the right when it collided least ally with a 2 kg ball moving at 6 m/s to the left. After the collision, the 5 kg ball is moving .8 m/s to the right. What is the velocity of the 2 kg ball?

Answer 1

let's call right positive

momentum is conserved

(5 * 4) - (2 * 6) = (5 * .8) + (2 * v)

8 = 4 + 2v