NEET 2025 — Physics solution

NEET2025Physics

A body weighs $48$ N on the surface of the earth. The gravitational force experienced by the body due to the earth at a height equal to one-third the radius of the earth from its surface is:

A
16 N
B
27 N
C
32 N
D
36 N

Solution

At height $h$ , gravitational force becomes $W^{'} = m g (\frac{R}{R + h})^{2}$ .

With $h = R /3$ : $W^{'} = 48 (\frac{R}{R + R /3})^{2} = 48 (\frac{3}{4})^{2} = 48 \times \frac{9}{16} = 27$ N.

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