5
lesson pretestMultiple Choice

Pretest

Question 5 • Physics I

Which is an example of projectile motion?

Answer
A
an athlete running on a track
B
a teacher picking up a pencil
C
a person throwing a rock
D
a child swinging on a swing set

Explanation

Projectile motion occurs when an object is launched and then moves through the air mainly under the influence of gravity. A rock thrown by a person follows this kind of path, while swinging, running, and picking up a pencil do not describe an object traveling freely through the air.

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