Question

A force used to lift a 25kg mass to a height of 12m in 5 sec does 2100J of work. How much force is used?

DO NOT INCLUDE UNITS BUT KNOW THAT FORCE IS IN NEWTONS.

Answer 1

By definition we have that the work done in one direction, is given by the multiplication of the force exerted in that direction by the distance traveled.
 So, we have:
 Work = Force * distance
 2100 J = Force * 12 m
 Force = 175 N
 The other data, are extras.
 Answer
 Force = 175 N