Question
You have a 120-g yo-yo that you are swinging at 0.9 m/s. How much energy does it have? How high can it get above the lowest point of the swing without your doing any additional work, on Earth? How high could it get on the Moon, where gravity is 1/6 Earth’s?

$KE = 0.049 \textrm{ J}$

$h_E = 4.1 \textrm{ cm}$

$h_M = 25 \textrm{ cm}$

Solution Video