A horizontal force of 120 N is used to push a 49 kg box 5.4 m on a rough, horizontal
surface.
The acceleration of gravity is 9.8 m/s
2.
1) If the box moves at constant speed, find the
work done by the 120 N force.
Answer in units of J.
2) How much energy is lost to friction?
Answer in units of J.
3) What is the coefficient of kinetic friction?

Two horses begin at rest. after a few seconds, horse a is traveling with a velocity of 10 m/s west, while horse b is traveling with a velocity of 13 m/s west. which horse had a greater acceleration? a. horse a because its change in velocity was greater than horse b's in the same time. b. horse b because its change in velocity was greater than horse a's in the same time. c. horse b because its change in velocity was the same as horse a's, but it took less time. d. both horses had the same acceleration.