A ball of mass 2.0 kg is travelling at a speed of 12 m/s. It moves towards an object of mass 3.0 kg which is at rest.

The ball hits the object and sticks to it.

Which row gives the total momentum, and the speed of both objects immediately after the collision?

total momentum (kg m/s)
A- 0
B- 0
С- 24
D- 24

AND..

speed (m/s)
A- 4.8
B- 8.0
C- 4.8
D- 8.0