Where Does Thermal Energy Come From in an Inelastic Collision?

[isukatphysics69]

Homework Statement

Homework Equations

n/a

The Attempt at a Solution

I am going through the final exam problem sets right now and just looked at the answer key and wondering where in this system there could be thermal energy? while i was working through the problem i assumed no thermal energy because of the frictionless floor. where in this system is there thermal energy coming from?
also wondering why momentum was not conserved

 

[BvU]

where in this system is there thermal energy coming from?
also wondering why momentum was not conserved

The two nicely fit together: in the inelastic collision (the blcks stick together) some kietic energy is absorbed and thus converted to thermal energy.

Good luck with your exam...

PS lousy picture to read for a helper, but I don't want to upset you at this time ...