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Two particle of equal mass are projected...

Two particle of equal mass are projected simultaneously from the roof of a tower of height 20 m with same speed 20m//s, one horizontally and the other vertically upwards. Choose the correct alternative (s).

A

The acceleration of center of mass is g//2 downwards

B

The acceleration of centre of mass is g downwords

C

Maximum height of centre of mass centre of mass from the ground is 25 m

D

Maximum height of centre of mass from the ground is 40 m

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