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Question: At surface of earth weight of a person is 72 N then his weight at height R/2 from surface of earth i...

At surface of earth weight of a person is 72 N then his weight at height R/2 from surface of earth is (R = radius of earth)

A

28N

B

16N

C

32N

D

72N

Answer

32N

Explanation

Solution

Weight of the body at height R, W′=W(RR+h)2W ^ { \prime } = W \left( \frac { R } { R + h } \right) ^ { 2 } =W(RR+R2)2= W \left( \frac { R } { R + \frac { R } { 2 } } \right) ^ { 2 }