Work and Power


Problems

Problem :

What is the kinetic energy of a 2 kg ball that travels a distance of 50 meters in 5 seconds?


Problem :

In a sense we all have kinetic energy, even when we are standing still. The earth, with a radius of 6.37×106 meters, rotates about its axis once a day. Ignoring the earth's rotation about the sun, what is the kinetic energy of a 50 kg man standing on the surface of the earth?


Problem :

A ball is dropped from a height of 10 m. What is its velocity when it hits the ground?


Problem :

A ball is thrown vertically with a velocity of 25 m/s. How high does it go? What is its velocity when it reaches a height of 25 m?


Problem :

A ball with enough speed can complete a vertical loop. With what speed must the ball enter the loop to complete a 2 m loop? (Keep in mind that the velocity of the ball is not constant throughout the loop).


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