Question

A 2 kg ball of putty moving to the right at 3m/s has a head-on inelastic collision with a 1 kg ball of putty moving to the left at 3m/s. What is the final magnitude and direction of the velocity of the stuck together balls after the collision?

Answer 1

Apply conservation of linear momentum.

2*3 - 1*3 = (2+1)*Vfinal

Momentum remains to the right, since the right-moving mass had more momentum.