Question

A girl whose mass is 50Kg carries a box of mass 20Kg up a flight of steps. There were 20 steps each 20cm high. She takes 16s to climb up steps (gravitation is 10m/s )
What is the total gravitation potential energy of the girl and the box?

Answer 1

Answer: 2800

Explanation: formula of potential energy  is (mass)(gravity)(height).Mass is 50kg+20kg = 70kg, Gravity is 10ms^-1 and height is (0.2)(20) = 4m. (70)(10)(4)  = 2800