Question

A store of mass 5kg was raised from the ground to the second floor of height 7m and from there to the third floor of height 3m from the second floor. Calculate the potential energy of the store with respect to the ground floor and the second floor?

Answer 1

Mass m = 5kg

Height from ground to third floor

h = 7m + 3m

g = 10m/s²

Potential energy with respect to the ground

U = mgh = 5kg × 10m/s² × 10 = 500J

Height from second floor to third floor h = 3m

Potential energy with respect to the second Floor

U = mgh = 5kg × 10m/s × 3 = 150J