Laws of MotionHard
Question
A block is placed on a rough horizontal plane. A time dependent horizontal force F = kt acts on the block. Here k is a positive constant. Acceleration -time graph of the block is
Options
A.

B.

C.

D.

Solution
Block starting when kt0 = μmg

so for t < t0, a = 0
and for t > t0, a =

so for t < t0, a = 0
and for t > t0, a =
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