A ball at rest falls from a platform above the ground. The ball falls freely and hits the ground 3 s later. What is the height of the platform?
(use -9.8 m/s2 today for the acceleration due to gravity)

How is the ideal mechanical advantage of a wheel and axle calculated?

The amount of potential energy possessed by an elevated object is equal to

Earthquakes and volcanic eruptions are examples of rapid events that are caused by the movement of earth's mountain building is a much more slow process, which is caused by the movement of earth's a. ocean tides; crustal plates b. ocean tides; winds c. crustal plates; crustal plates d. crustal plates; ocean tides