Question

Sarita lives on the 3rd floor of the building at a height of 15 m she carries a School Bag weighing 5.2 kg from the ground floor to her house. Find the amount of work done by her. Identify the force against which she has done the work. Take $g=10m/s^2$.

Answer 1

Given -

Mass = m = 5.2 kg

Height = h = 15 m

Acceleration due to gravity = $g=10m/s^2$

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.