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Body of mass M has velocity = 0
bullet of mass m has velocity = v

After bullet is embedded in the body,
let the velocity of the system = V

The momentum of the system is conserved
So momentum of system = m×v + M×0 = mv

mv + M×0 = (M+m)V
⇒mv= (M+m)V
⇒ V =  \frac{mv}{M+m}

KE= \frac{1}{2} \times (M+m) \times V^2 \\ \\KE=\frac{1}{2} \times (M+m) \times ( \frac{mv}{M+m} )^2\\ \\ KE= \frac{(mv)^2}{2(M+m)}


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