Answer:
Option A,B
Explanation:
△xcm of the block and point mass system=0
m(x+R)+Mx=0
where x is the displacement of the block
solving the equation we get
x=−mRM+m
From the conservation of momentum and mechanical energy of the combined system.
0=mv-MV
mgR=12mv2+12MV2
Solving these two equations, we get
v=√2gR1+mM