Question

A horizontal force F is used to pull a 5-kilogram block across a floor at a constant speed of 3 meters per second. The frictional force between the block and the floor is 10 newtons. The work done by the force F in 1 minute is most nearly 

(A) 0J 

(B) 30J 

(C) 600J 

(D) 1,350J 

(E) 1,800J

Answer 1

Correct option (E) 1,800J

Since the speed is constant, the pushing force F must equal the friction force (10N). The distance traveled is found by using d = vt = (3)(60 sec), and then the work is simply found using W = Fd.