Laws of MotionHard

Question

Block A and C start  from rest and move to the with acceleration aA = 12t m/s2 and aC = 3 m/s2 . here t is in seconds. The time when block B again to rest is


Options

A.2s
B.1s
C. s
D. s

Solution

Block B will again comes to rest if
vA  = vc i.e. 3t = (12t)t/2 ⇒ t = s

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