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A ball of mass 1 kg is thrown up with an...

A ball of mass `1 kg` is thrown up with an initial speed of `4 m//s`. A second ball of mass `2 kg` is released from rest from some height as shown in Fig. Choose the correct statement (s).

A

The centre of mass of two balls comes doen with acceleration `g//3`

B

The centre of mass of first moves up then comes down

C

Acceleration of centre of mass is `g` downwards

D

The centre of mass comes down with constant velocity.

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