# 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).

## Take a Study Break

##### SparkLife

Check out her 20 best red carpet looks here!

### 100 types of CRUSHES

Which have you crushed on?

### Hot, fresh, celebrity tweets!

What are your favorite celebs saying? Click to find out!

### Hate Bieber?

##### SparkLife

Click to find out!

### We Rank the Doctors

Did we get it right?

### Monsters of the Ocean

You'll never swim again.

### Toop 10 Underrated Geniuses

They got no love!

### Fantasy Book Covers...

...Recreated by THIS guy!