Write down the answer to the previous question and then answer the following question.

22. Two identical gliders slide toward each other on an air track. One moves at 1 m/s and the other at 2 m/s. They collide and stick. The combined mass moves at
(a) 3/4 m/s.
(b) 1/3 m/s.
(c) 1/6 m/s.
(d) 1/2 m/s.
(e) 1.5 m/s.