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A pendulum which gives correct time 2 s ...

A pendulum which gives correct time 2 s on the ground. It is moved to an altitude `640 m ` above the earth. If radius of the earth is 6400 km, how much time will the pendulum lose or gain in one day ?

A

loses `8640 s`

B

gains `4.32 s`

C

loses 8.64 s`

D

gains `8.64 s`

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