Q.

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

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a

40mm/s

b

60mm/s

c

113mm/s

d

120mm/s

answer is C.

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Detailed Solution

v=ω(a2−y2)=2602−202 =113 mm/s
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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