Tina and her puppy are tugging on a rope, each pulling on opposite ends.

when is tina doing work?

the entire time she plays with the puppy
whenever she pulls the puppy toward her
when she holds the rope steady as the puppy pulls it
when she lets go of the rope and the puppy pulls it away

Answer : The correct option is (b).

Explanation :

The work is said to be done when a force is applied on an object in order to attain some displacement.

Mathematically, the work done is given as :

F is the applied force

d is the displacement of an object.

In this case, Tina and her puppy are tugging on a rope, each pulling on opposite ends.

The work will be done by Tina whenever she applies a force in order to move the puppy toward her.

Hence, the correct option is (b) " whenever she pulls the puppy toward her ".