lincolnsamuels
15

# What is the velocity of an 500-kilogram elevator that has 4,000 joules of energy?

$E=\frac{mv^2}2 \\ 2E=mv^2 \\ v^2=\frac{2E}m \\ v=\sqrt\frac{2E}m \\ v=\sqrt\frac{8000}{500} \\ v=\sqrt{16} \\ v=4$ 4 meters per second.