The situation involves a baby pulling a toy car parallel to the ground.
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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.
When the displacement of the object is zero, the work done is also zero, regardless of the force applied. Mathematically, W = F . s, and if s = 0, then W = F . 0 = 0 joules.
When the force acting on an object is zero, the work done is also zero, regardless of the displacement. Mathematically, W = F . s, and if F = 0, then W = 0 . s = 0 joules.