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Body weight on the surface is mg = 72 N. Calculate the body weight at height H = R/2.

1. 72 N
2. 32 N
3. 48 N
4. 64 N

Correct answer: 48 N

Solution

The weight of a body decreases with height according to the formula W' = W(1 + h/R)^-2. Substituting h = R/2, W' = 72(1 + 1/2)^-2 = 72(3/2)^-2 = 72 × (4/9) = 32 N.

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