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JEE PYQ: Gravitation Question 2

Question 2 - 2021 (16 Mar Shift 2)

If one wants to remove all the mass of the earth to infinity in order to break it up completely. The amount of energy that needs to be supplied will be $\frac{x}{5}\frac{GM^2}{R}$ where $x$ is ______.

(Round off to the Nearest Integer)

Show Answer

Answer: 3

Solution

Energy required $= U_f - U_i = 0 - \left(-\frac{3GM^2}{5R}\right) = \frac{3}{5}\frac{GM^2}{R}$. So $x = 3$.


Learning Progress: Step 2 of 49 in this series