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Energy Loss in Collision

CLMECH-GHINJ5

In which of the three completely inelastic collisions below (the collisions are numbered on the right side of the image), is the most Kinetic Energy lost (or released) by the system?

You may assume that the brick wall is immovable.

A

Collision 1

B

Collision 2

C

Collision 3

D

It depends on the exact value of $M$.