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The equation of motion of a particle started at t = 0, is given by y=5sin40t+π6cm.  The least time after which acceleration becomes maximum is

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a
π90sec
b
π80sec
c
π60sec
d
π120sec

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detailed solution

Correct option is B

Particle starts from mean position. The acceleration becomes first time maximum when it reaches extreme position.t=T4=π240=π80s


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