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Q.

A man measures time period of a pendulum (T) in stationary lift. If the lift moves upward with acceleration g4,then new time period will be

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a

2T5

b

5T2

c

52T

d

25T

answer is A.

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Detailed Solution

T=2πlg⇒TT'=gg′=gg+g4=45=25
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