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Blocks P and R starts from rest and move...

Blocks P and R starts from rest and moves to the right with acceleration `a_(p) = 12t m//s^(2) and a_(R) = 3 m//s^(2)`. Here t is in seconds . The time when block Q again comes to rest is

A

1 s

B

`3/2 s`

C

2 s

D

`1/4 s`

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The correct Answer is:
D
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