Answer:
Explanation:
The energy is potential energy, mgh.
m = mass in kg
g = acceleration due to gravity (alot of talk about whether g is 9.8, 9.81 or 10)
h = height above your zero line (alot of times distance to the ground)
PE = mgh = 4 * 10 * 2 = 80 Nm or 80 Joules
