A 70 kg boy is sitting 3 m from the ground in a tree. What is his potential energy?

Answer:2058 joules

Explanation:

Mass (m) = 70kg

Acceleration due to gravity (g) = 9.8m/s^2

Height (h) = 3m

potential energy=m x g x h

Potential energy=70 x 9.8 x 3

Potential energy=2058

Potential energy (Ep) is equal to the mass (m) of the subject multiplied by the height (h) from sea level that its positioned multiplied by the earth acceleration (g).

Ep = mgh

In your case m = 70 kg, g = 9.8m/s^2, h = 3m, all the units are in SI, so simple multiplication gives Ep = 2060 J or Nm^2