Hi all,(adsbygoogle = window.adsbygoogle || []).push({});

I came across a problem on collisions on one of my professors old exams. The problem is:

http://home.comcast.net/~msharma15/problem_2.jpg

The way I am trying to approach it is by applying the conservation of linear momentum and energy, but the problem is that I still get left with 3 unknowns.

Here is what I know:

Before the collision, onlyblock Ahas kinetic energy.

After the collision, the K.E. of system is (1/2 K.E. initial).block Ahas-1/2MV^2and block B has1/2MV^2.

The final collision is what confuses me. Should I just work with K.E.i (only block A moving) with conservation of linear momentum?

Any help would be greatly appreciated. Thanks!

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# Collisions problem (How should I approach it)

**Physics Forums | Science Articles, Homework Help, Discussion**