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A block A of mass 2m is hanging from a v...

A block A of mass 2m is hanging from a vertical massless spring of spring constant k and is in equilibrium. Another block B of mass m strikes the block A with velocity u and sticks to it as shown in the figure. The magnitude of the acceleration of the combined system of the blocks just after the collision is

A

(a)`g//2`

B

(b)g/3

C

(c)g

D

(d)zero

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