If a 7500 N box is lifted by a forklift 8 meters , how much work was done?

W= f×d

= 7500×8

= 60,000 Joule

0.147 J

Explanation:

The total energy that has been transformed into thermal energy is equal to the loss of gravitational potential energy between the initial situation (bob at h=0.5 m above the ground) and the final situation (bob back but at h=0.45 m above the ground).

Therefore, we have

where

m = 0.3 kg is the mass of the bob

g = 9.8 m/s^2

h1 = 0.5 m is the initial height

h2 = 0.45 m is the final height

Substituting, we find the thermal energy

Therefore, the energy transformed into thermal energy is 0.147 J.