A 90 mathrm{~kg} body placed at 2 mathrm{R} distance from surface of earth experiences gravitational

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7.Gravitation

hard

A $90 \mathrm{~kg}$ body placed at $2 \mathrm{R}$ distance from surface of earth experiences gravitational pull of : ( $\mathrm{R}=$ Radius of earth, $\mathrm{g}=10 \mathrm{~ms}^{-2}$ )

A

$300 \mathrm{~N}$

B

$225 \mathrm{~N}$

C

$120 \mathrm{~N}$

D

$100 \mathrm{~N}$

(JEE MAIN-2024)

Solution

Value of $g=g_5\left(1+\frac{h}{R}\right)^{-2}$

$=\mathrm{g}_5(1+2)^{-2}=\frac{\mathrm{g}_5}{9}$

Here $\mathrm{g}, \mathrm{g}$ gravitational acceleration at surface

$\text { Force }=m g=90 \times \frac{g_5}{9}=100 \mathrm{~N}$

Standard 11

Physics

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