Which of the following statements about physical models is not true?
a.
physical models are often three-dimensional representations.
b.
physical models are used to represent an object or event.
c.
physical models are usually in the form of a graph.
d.
physical models can be used to depict microscopic objects.

A60-kg skier starts at the top of a 10-meter high slope. at the bottom, she is traveling 10 m/s. what is the gpe? gpe =mgh 2,880 j 5,880 j 3,000 j 1633j

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?