JEE Main 2022 · 29 Jul · Shift 2 · Physics Q42

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PhysicsSingle correct+4 / -1Question 42 of 90

An object of mass 1 kg is taken to a height from the surface of earth which is equal to three times the radius of earth. The gain in potential energy of the object will be

[If, g = 10 m s $^{-2}$ and radius of earth = 6400 km]

48 MJ

24 MJ

36 MJ

12 MJ

Answer and worked solution

Official answer: A

Gain $\dfrac{GMm}R-\dfrac{GMm}{4R}=\dfrac34mgR=\frac34\times10\times6.4\times10^6=48$ MJ.

(A)

Topics:Gravitational field and potential

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JEE Main 2022 · 29 Jul · Shift 2, Physics question 42