The work done is equal to the product of the force and displacement.
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The baby has exerted a force in the direction of displacement of the car.
The situation involves a baby pulling a toy car parallel to the ground.
For work to be done on an object, two conditions must be satisfied: 1. A force must be applied to the object. 2. The object must be displaced in the direction of the force.
Both conditions are met: a force is applied, and the book is displaced upwards.