Need some AP Physics help?

Question

A fisherman reels in 20.0 m of line while pulling in a fish that exerts a constant resisting force of 18.0 N. If the fish is pulled in at constant speed, how much work is done on it by the tension in the line?

Thanks!

Answer 1

Since we're pulling in at constant speed, there is not acceleration, so the tension is exerting exactly 18.0 N of force on the fish.

Work = Force * Displacement

In this case, the Displacement is 20.0m, and the Force is 18.0N.

Therefore:

Work = 20.0*18.0 = 360.0 Joules