A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be

Question

A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be, 1 2 m 2 v 2 m + M, 1 2 M m v 2 m + M, 1 2 m v 2 M + m M, 1 2 m M v 2 M + m

MARKS App · Accepted Answer

m v = M + m v ′ v ′ = m v M + m K . E . o f c o m p o s i t e b l o c k = 1 2 M + m v ′ 2 = 1 2 M + m × m 2 v 2 M + m 2 = m 2 v 2 2 M + m

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