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Questions  

The time period of a simple pendulum inside a stationary lift is 5sec. What will be the time period when the lift moves upward with an acceleration  g/4?

a
5seconds
b
25seconds
c
2+5seconds
d
2 seconds

detailed solution

Correct option is D

In upward accelerating lift,  geff = g + a   T=2πlg and T1=2πl(g+g/4) ⇒T1T=25 given T=5 ⇒T1=25T=255 ⇒T1=2 seconds

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