A Cart at the top of a 300m hill has a mass of 40kg. what is the carts gravitational potential energy?

G. p. e = mgh

m for mass = 40 kg

g for gravitational field strength = 10 N/kg

h for height = 300m

Plug them in:

g. p. e = 40 * 10 * 300

= 120000 J

In terms of kilo joule:

1 kJ = 1000 J

so 120000 J = 120 kJ