Question

In which of the following situations is the force doing work?

a. A backpacker is hiking along a flat path carrying a heavy backpack.
b. An elephant is pushing another elephant; neither elephant is moving.
c. A popcorn vendor is walking around the neighborhood carrying two heavy buckets of popcorn.
d. The gravitational force pulls down on a rock that is freely falling.

Answer 1

the answer is d).........

Answer 2

Option c

Because the displacement is in the direction of force

Hope it helps