Question

Two identical gliders slide toward each other on an air track. One moves at 1m/s and the other at 2m/s. they collide and stick. the combined mass moves at
A. 1.5m/s
B. 1/3m/s
C. 1/6m/s
D. 3/4m/s
E. 1/2m/s
which of this options is the right answer?
The option that preserves total momentum is the correct one.
Note that the final mass is 2M, and that the initial individual momenta have opposite signs.

(2m/s)*M -(1m/s)*M = 2M*Vfinal

Solve for Vfinal
could you help me and solve it please. I tried to solve it but I couldn't get the right answer.
If you can't solve that just give up on life man.

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