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Question

A particle executes linear simple harmonic motion with amplitude of 2 cm. When the particle is at 1 cm from the mean position, the magnitudes of the velocity and the acceleration are equal. Then its time period (in seconds) is ________________.

A
2π3
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B
32π
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C
2π3
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D
12π3
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Solution

The correct option is A 2π3
let x= 2sin(ωt)
then vx=2ωcos(ωt)
and ax=2ω2sin(ωt)
If x=1 then sin(ωt) = 0.5
or (ωt) = π6
put this value in eqn 2 and eqn 3 and then equate both
we get $\omega t= -cot(ωt)
or ω=3s1

T = 2π3 sec


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