A spring (k = 200 N/m) is compressed by 0.05m. This spring is then released and accelerates a mass of 2 kg across a level surface.

1.) How much work does the spring do after it is released?(you should see a numerical answer!)

2.) How much kinetic energy does the mass have when it leaves the spring?(you should see a numerical answer!)

3.) What is the velocity of the mass when it leaves the spring?(you should see a numerical answer!)

A physics book of an unknown mass is dropped from a height of 5m above the ground. (Use g = 9.8 m/s^2)

1.) What type of energy does the book have initially?

2.) What type of energy does the book have just before it hits the ground?

3.) What is the speed of the book just before it hits the ground?(you should see a mathematical answer!)

A car engine exerts a 1000 N force on the car for 250 m. The trip takes 20 seconds.

1.) How much work did the engine do? (you should see a numerical answer!)

2.) What was the power output of the engine?(you should see a numerical answer!)