Question

# A body of mass 10 kg is dropped to the ground from a height of 10 metres. The work done by the gravitational force is $$( g = 9.8 m / sec^2 )$$

A
$$-490 \quad joules$$
B
$$+490 \quad joules$$
C
$$-980 \quad joules$$
D
$$+980 \quad joules$$
Solution
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#### Correct option is D. $$+980 \quad joules$$Work done is given by:$$W=Fs$$Where F is the force and s is the displacementAs the body moves in the direction of force, therefore work done by gravitational force will be positive.$$W = Fs =mgh = 10 \times 9.8 \times 10 = 980 J$$

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