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## Homework Statement

1) Two identical bodies, each with rest mass m(o), approach each other with equal velocities u, collide and stick together in a perfectly inelastic collision. Determine the rest mass of the composite body.

## Homework Equations

## The Attempt at a Solution

The solution as given in my book is:

Let M(o) be the rest mass of the composite body.

E(initial)=E(final)

[2m(o)c^2]/{[1 - u^2/c^2]^(1/2)} = M(o)c^2

Unlike non relativistic perfectly inelastic collisions, is Total energy conserved in perfectly inelastic relativistic collisions?