1) A crane uses an average force of 5,200 N to lift a girder 25 m. How much work does the crane do on the girder?

2) An apple weighing 1 N falls a distance of 1 m. How much work is done on the apple by the force of gravity?

1) 130, 000 J

2) 1 J

Explanation:

1)

Work done is product of force in Newtons and distance in meters

W=Fd

Given an average force of 5,200 N and distance of 25 m then we evaluate that

Work done=5200*25=130, 000 Nm or Joules

2)

Similarly, for the second question, given force of 1N and distace of 1 m then the work done will be

W=1*1=1 J