Ncert Exercises & Solutions

Q.25 Calculate the work done by a car against gravity in moving along a straight horizontal road. The mass of the car is 400 kg and the distance. moved is 2 m.

Hint: Work done by the force is zero if the angle between force and displacement is 90

°

Step 1: Find work done by the car against gravity.

The force of gravity acts on the car vertically downward while the car is moving along a horizontal road, i.e., the angle between them is 90 $°$

$∴$ Work done by the car against gravity

$W = Fs \cos 90 ° = 0 (∵ \cos 90 ° = 0)$

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