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On a planet, a body is let fall freely from a height 8m reaches the ground in 2 sec. If the length of a simple pendulum is 1m on that planet, its time period is

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a
3.14 sec
b
6.24 sec
c
1.57 sec
d
4.71 sec

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detailed solution

Correct option is A

s=ut+12at28=0+12gp×4gp=4m/sec2T=2π14=2π2=πsec=3.14sec

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