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A block of mass m is connected to anothe...

A block of mass `m` is connected to another block of mass `M` by a massless spring of spring constant `K`. Blocks are kept on a smooth horizontal plane. Initally both the blocks the at rest and spring is unstressed. Force ` F` is applied on `M` to right as shownin the figure then which of the following is correct ?

A

Acceleration of the centre of mass is `(F)/(M+m)`

B

At the instant of maximum elongation of the spring, acceleration of centre of mass is zero.

C

At maximum extension of the spring acceleration of centre of mass is `(F)/((M+m))`

D

At maximum extension, velocity of both the blocks will be same.

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