Question

55,000J of work is done to move a rock 25m. How much force was applied?

Answer 1

First, recall the definition of work. The work done by a constant force is equal to the force multiplied by a displacement  

s:W=F⋅s

 If the work done was 55,000 Joules, and the displacement traversed was 25 meters, then all you need to do is substitute into the equation:

55,000J=25m⋅F

 Divide both sides by 25 meters to solve for  F:

  55,000J/25m=F

 Since the Joule is defined as Newtons multiplied by meters, the meters will cancel off, and our answer will be:

F=2,200N

 :.Force F = 2200N.