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Calculate the work done by a car against gravity in moving along a straight horizontal road. The mass of the car is 400 $\mathrm{kg}$ and the distance moved is $2 \mathrm{~m}$. As we know that $W D=$ Fs $\cos \theta$.
Solution:
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Verified Answer
Force of gravity acts on the car vertically downward while car is moving along horizontal road, i.e., angle between them is $90^{\circ}$. So work done is
$$
W D=F s \cos 90^{\circ}=0 \quad\left(\because \cos 90^{\circ}=0\right)
$$
Hence, work done by car against the gravity is zero.
$$
W D=F s \cos 90^{\circ}=0 \quad\left(\because \cos 90^{\circ}=0\right)
$$
Hence, work done by car against the gravity is zero.
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