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Question

Assertion (A): The phase difference between displacement and velocity in SHM is 90
Reason (R): The displacement is represented by y=A sinωt and Velocity by V=Aωcosωt.

A
Both A and R are true and R is the correct explanation of A
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B
Both A and R are true and R is not the correct explanation of A
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C
A is true and R is false
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D
A is false and R is true
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Solution

The correct option is A Both A and R are true and R is the correct explanation of A
At mean displacement is Zero but velocity is maximum At extreme position displacement is maximum but velocity is Zero.
Thus displacement can be represented by
y= A sin wt
V=dydt
=Awcoswt=Awsin(wt+π2)
Thus phase difference is π2

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