Question

The height at which the weight of a body becomes 1/16th its weight on the surface of earth (Radius R ) is:

A
4R
B
5R
C
15R
D
3R
Solution
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GMm(R+h)2=116GMmR21(R+h)2=116R2or,(RR+h)2=116⇒RR+h=14.∴R+h=4R⇒h=3R

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