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A simple pendulum has time period 4s at ...

A simple pendulum has time period 4s at earth surface. An another simple pendulum of same length at height h from earth surface has time period of 6s. If radius of earth is 6400km then find value of h

A

a. 1600km

B

b. 3200km

C

c. 6400km

D

d. 12800km

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