# physics help

posted by
**david**
.

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below.

(a) elastic collision

ball 1

ball 2

(b) completely inelastic collision

ball 1

ball 2

i solved part a but cant figure out part b. if i make the assumption that in a completley ineleastic equation the balls are stuck togtether and have the same velocity, how would i go about solving it.