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MHT CET 2021 (23 Sep, Shift 1) · Acceleration Due to Gravity

Acceleration Due to Gravity question from MHT CET 2021 (23 Sep, Shift 1)

Q92MHT CET 2021 · 23 SEP · SHIFT 1Medium

Acceleration Due to Gravity

The mass of a spherical planet is 4 times the mass of the earth, but its radius (R) is same as that of the earth. How much work is done is lifting a body of mass 5 kg through a distance of 2 m on the planet? (g = 10 ms $-2$ )

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Answer: (a)

$g_p = \frac{G(4M)}{R^2} = 4g = 40\text{ m s}^{-2}$
$W = mg_p h = 5 \times 40 \times 2$
So the answer is (a) $400\text{ J}$ .

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