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What force and weight act on a mass of 10.5kg being pulled by earth? Take \( g= \) \( 10 m s^{-2} \)

1. 105 N, 10.5
2. 105 N, 105 N
3. \( 100 \mathrm{N}, 105 \mathrm{N} \)
4. 10.5 N, 10.5 N

Correct answer: 105 N, 105 N

Solution

The force exerted by Earth on the mass is its weight, given by W = mg. With m = 10.5 kg and g = 10 m/s², both the gravitational force and the weight are 105 N.

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