Physics Problems (2) : Work & Power

Question

1. Calculate the work done you need to do to raise a 9 kg box a vertical distance of 3 meters. Show all work.
2. When the same box is raised the same vertical distance by pushing it up a 5m long ramp, only 54 N of force is required. Calculate the work done to push the box up the ramp. Show all work.

Answer 1

(1)

 

W = (mg)d = (9 kg)(9.8 m/s^2)(3 m) = 264.6 J

 

 

(2)

 

W = Fd = (54 N)(5 m) = 270 J