Question

A 0.2 kg ball moves to the right with a speed of 3 m/s. It hits a 0.5 kg ball that at rest. After collision, the second ball moves to the right with a speed of 1 m/s. What is the speed of the first ball after collision?
Ms. Sue
You seem to want answers, not help.
Please help
I don't know how to answer this, that's why I need help