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Questions  

A body is executing simple harmonic motion with an angular frequency 2rad/s . The velocity of the body at 20 mm displacement, when the amplitude of motion is 60 mm, is

a
40mm/s
b
60mm/s
c
113mm/s
d
120mm/s

detailed solution

Correct option is C

v=ω(a2−y2)=2602−202 =113 mm/s

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A horizontal platform with an object placed on it is executing S.H.M. in the vertical direction. The amplitude of oscillation is 3.92×103m . What must be the least period of these oscillations, so that the object is not detached from the platform 


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