A 20.0 kg suitcase is raised 3.0 m above a platform. How much work is done on the suitcase?

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.