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Question

Amplitude of a mass spring system, which is executing simple harmonic motion decreases with time. If mass =500 g, damping constant =20 g/s then how much time is required for the amplitude of the system to drop to half of its initial value?
(ln2=0.693)

A
15.01 s
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B
17.32 s
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C
0.034 s
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D
34.65 s
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Solution

The correct option is D 34.65 s
In damped oscillation, amplitude is given as: A=A0ebt2m From question, A=A02
12=ebt2m

bt2m=ln2=0.693

t=2mb×0.693

t=2×50020×0.693

t=50×0.693=34.6 s

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