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Question

A body executing linear simple harmonic motion has a velocity of 3 cm/s, when its displacement is 4 cm and a velocity of 4 cm/s, when its displacement is 3 cm. What is the amplitude of oscillation?

A
5 cm
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B
7.5 cm
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C
10 cm
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D
12.5 cm
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Solution

The correct option is A 5 cm
In SHM, the velocity V at a displacement x is given by
V=ω(A2x2)12or V2=ω2(A2x2)
Now
V=3 cm/s
When,
x=4 cm.9=ω2(A216)......(i)

Also
V=4cm/s
When,
x=3 cm16=ω2(A29)......(ii)
Simultaneous solution of equations (i) and (ii) gives
A=5 cm

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