A body weighs at Earth’s surface

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

A body weighs

500\,\text{N}

at Earth’s surface. At what approximate height above the surface will its weight decrease to

450\,\text{N}

? (Assume the height is small compared to Earth’s radius

R = 6400\,\text{km}

.) (a)

160\,\text{km}

(b)

640\,\text{km}

(c)

710\,\text{km}

(d)

320\,\text{km}