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Question

A particle is executing simple harmonic motion along a straight line. At displacements r1 and r2 from its mean position the velocities are v1 and v2. The time period of the particle is:

A
2π[v21v22r22+r21]1/2
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B
12π[v21+v22r22r21]1/2
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C
2π[r22r21v21v22]1/2
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D
2π[r22r21v22v21]1/2
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Solution

The correct option is D 2π[r22r21v21v22]1/2
Let the SHM be represented by x=Asinωt
Thus v=Aωcosωt
r1=Asinωt1
v1=Aωcosωt1
r21+v21ω2=A2
Similarly, r22+v22ω2=A2
r21+v21ω2=r22+v22ω2
ω= v21v22r22r21
Thus time period of particle=T=2πω
=2π[r22r21v21v22]1/2


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