1.A student is pushing a 30 kg desk across a floor at a
constant speed of 1 m/s. How
much work, tothe nearest whole joule, mustthe student do on the desk to change the speed to 6 m/s?

2. A 5 kg stone falls from the
top of a cliff and strikes the
ground at a speed of 88.5 m/s.
What is
the height of the cliff?

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.

The items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element