Sarita lives on 3rd floor of building at the height of 15 m. She carries her school bag weighting 5.2 kg from the ground floor to her house. Find the amount of work done by her and identity the force against which she has done work (g = 10 ms–2)
Mass = m = 5.2 kg Height = h = 15 m Acceleration due to gravity = g=10m/s2 To find - Work done Solution - We know that, Potential Energy = mgh P.E. = 5.2×(-10)×15 P.E. = -780 Joules She had done work against the force of gravity because she displaces herself from the ground floor to her house.
