Inelastic collisions – conservation of energy

1. The problem statement, all variables and given/known data

2. Relevant equations

K = E + U
E = 1/2mv^2
U = mgh

3. 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?

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