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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 center of mass of the two balls comes down with· an acceleration of `(g)/(3)`

B

The center of mass first moves up and then comes down

C

The acceleration of the ,center of mass is g downwards

D

The center of mass of the two balls remains stationary

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