1.

The equation of motion of a particle started at `t=0` is given by `x=5sin(20t+pi//3)` where x is in centimeter and t in second. When does particle (a) first come to rest (b) first have zero acceleration (c) first have maximum speed?A. `(pi)/(90)sec`B. `(pi)/(120)sec`C. `(pi)/(60)sec`D. `(pi)/(30)sec`

Answer» Correct Answer - D
`a = (d^(2)y)/(dt^(2)) =0` at mean position, particle is initially moving towards positive exterme.


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