- #1

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## Homework Statement

## Homework Equations

K = E + U

E = 1/2mv^2

U = mgh

## The Attempt at a Solution

So I think that for a, half the final velocity of m is equal to the initial velocity of 2m. So that's v = sqrt(2gr)/2? Momentum is not conserved because normal force and gravity are acting on block m correct? Then what do I do from there, and on b and c?