Practice!

Sample Problem

If the total mechanical energy of a swinging pendulum is 7.5 J, and its mass is 1.5 kg, what is the maximum height reached?

Solution

We are given U and m, and g is a constant equal to 9.81m/s2.

We plug in all of these values U= 7.5 J , m= 1.5 Kg and get h= U/ mg= 7.5/(1.5)(9.81) = 0.5 m