Correct option: (B) Decreases but does not become zero
Explanation:
1st body : mass – m1 velocity – v
2nd body : mass – m1 velocity – o
They get embedded then velocity be V
by
law of conservation of momentum,
m1v + m1o = (m1 + m1)V
m1v = 2m1V
V = (v/2)
i.e. Velocity decreases but doesn’t become zero.