Starting from the origin a body oscillates simple harmonically with a period of 2 s. After what time will its kinetic energy be 75% of the total energy?
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a
13sec
b
112sec
c
16sec
d
14sec
answer is C.
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Detailed Solution
Velocity =A ω cos ωt KE=12mv2=12mA2ω2cos2ωt=3412mA2ω2 cos ωt=32⇒ωt=π6⇒t=16sec