Question

Is work done if you carry a book across the room at a constant velocity?

Answer 1

Yes because it has been moved from its original point. if had stayed inone spot or had been dropped no work would have been done.

Answer 2

NO

Step-by-step explanation:

As we know by work energy theorem that work done by all forces is given by change in kinetic energy of the system

it is given as

`W_(net) = KE_f - KE_i`

so here since the kinetic energy is constant for the system

so here change in kinetic energy is zero

hence the net work done must be zero

Here we know that

`v_i = v_f`

so here we can say that

`\Delta KE = 0`

so no work is required to move the books at constant speed from one position to other position