Question

A construction crane is on top of a skyscraper which has height 45m. The crane itself is 10m in height. What is the gravitational potential energy in joules of a 60kg worker who is standing on top of the crane? (Use g=9.81 in your calculations)

Answer 1

32340J

Step-by-step explanation:

Given parameters

Height of skyscraper = 45m

Height of crane = 10m

Mass of worker = 60kg

g = 9.81m

Unknown:

Gravitational potential energy = ?

Solution:

The gravitational potential energy of a body is the energy due to the position of the body.

It is expressed as:

G.P.E = mgh

m is the mass

g is the acceleration due to gravity

h is the height = 45 + 10 = 55m

G.P.E = 60 x 9.8 x 55 = 32340J