These need to be checked, especially after version A.
Solutions to many wikiquiz questions (pdf)
On object of mass 2.8 kg that is moving at a velocity of 23m/s collides with a stationary object of mass 20.47 kg. What is the final velocity if they stick? (Assume no external friction.)
A car of mass 637 kg is driving on an icy road at a speed of 22 m/s, when it collides with a stationary truck. After the collision they stick and move at a speed of 7.7 m/s. What was the mass of the truck?