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25.The displacement of an object attached toa spring and executing simple harmonicmotion is given byx=2x102 cos meter.The time at which the maximum speed firstoccurs 1S:(A) 0.25 s(C) 0.75 s(B) 0.5 s(D) 0.125 s

Answer»

differentiate the X ,

we get V = -2*10-²πsin(πt)for V to be maximum.. the sin(πt) should be maximum..so it is at π/2 = πt = t = 1/2 = 0.5 sec

option B



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