A ball is thrown vertically upwards. Determine the work done by gravity when the ball travels upto a height of $15 m$ . Mass of the ball $= 1 kg$ . Acceleration due to gravity $(g)$ $= 10 {m/s}^{2}$ .

150 J

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100 J

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- 150 J

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Zero

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Solution

The correct option is C $- 150 J$
We know that work done by gravity $(W_{g})$ is given by
$W_{g} = \to F . \to S$ , here force due to gravity is its weight $m g$ and displacement is given as, $S = 15 m$

Hence workdone will be

$W_{g} = m g s c o s 180^{\circ} = - 1 \times 10 \times 15$
$W g = - 150 J$

Hence option C is the correct answer

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A ball is thrown vertically upwards. Determine the work done by gravity when the ball travels upto a height of 15 m. Mass of the ball =1 kg. Acceleration due to gravity (g) =10 m/s2.

The correct option is C −150 J We know that work done by gravity (Wg) is given by Wg=→F.→S, here force due to gravity is its weight mg and displacement is given as, S=15 m Hence workdone will be Wg=mg s cos 180∘=−1×10×15 Wg=−150J Hence option C is the correct answer

A ball is thrown vertically upwards. Determine the work done by gravity when the ball travels upto a height of $15 m$ . Mass of the ball $= 1 kg$ . Acceleration due to gravity $(g)$ $= 10 {m/s}^{2}$ .