Question

Jerry thinks that if he pushes his car down a ramp it will go faster than if he just lets it roll down on its own.


What should he measure to test his prediction?
A.
how much the car weighs after each roll
B.
the height and the length of the ramp
C.
how hard he can push the car
D.
the distance the car rolls in 5 seconds
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Answer 1

D. The distance the car rolls in 5 seconds — that gives a direct measure of how fast it moves (greater distance in the same time = greater speed), so you can compare pushed vs. unpushed runs.