Answer to Question #141060 in Physics for Aryan Patel

Question

A 3kg object falls off an 9 m tall ledge.Due to friction it is only going 10 m/s at the ground.Calculate efficiency

g=9.8

Answer 1

$$\eta=\frac{0.5mv^2}{mgh}\\\eta=\frac{0.5(10)^2}{(9.8)(9)}=0.57$$