Question

A toy car slides down a frictionless track where the labeled vertical distances are 28.3 cm and 4.73 cm. If it starts from rest at point A, what is its speed at point B?

m/s

In the "Atlas Stones" event of the World's Strongest Man competition, contestants lift spherical stones of progressively increasing masses to various heights. What is the minimum power required to lift the 178-kg stone a vertical height of 1.49 m in a time of 5.31 s?

W

Answer 1

By Energy Conservation Law,

2.