The weight of a rock on the moon is $200.6 N$ . What is its mass on the earth? (Take $g$ of earth $= 9.8 m s^{- 2}$ and $g$ of moon $= 1.7 m s^{- 2}$ )

20 k g

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118 k g

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200 k g

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1180 k g

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Solution

The correct option is C $118 k g$
Given,
Weight of the rock on the moon, $W_{m} = 200.6 N$
Acceleration due to o gravity on the surface of the earth, $g_{m} = 9.8 m / s^{2}$
Acceleration due to o gravity on the surface of the moon, $g_{m} = 1.7 m / s^{2}$

We know,
Weight, $W = m \times g$

$⟹ m = \frac{W}{g}$

$⟹ m = \frac{W_{m}}{g_{m}}$

$m = \frac{200.6}{1.7}$

$m = 118 k g$

Mass of the rock on the earth $=$ Mass of the rock on the moon $118 k g$
The mass of an object is constant and does not change from place to place.

Suggest Corrections

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