7
practice testMultiple Choice

Practice Test

Question 7 • Physical Science

Which describes an object’s speed when free falling in a vacuum?

Answer
A
The object speeds up and then stops when air resistance equals gravity.
B
The object falls faster and faster until it strikes the ground.
C
The object falls at a constant speed because only one force acts on it.
D
The object accelerates until it reaches its terminal velocity.

Explanation

In a vacuum, there is no air resistance, so gravity continues to accelerate the object downward. Its speed increases as it falls, until it strikes the ground. Terminal velocity occurs when air resistance balances gravity, so it does not apply in a vacuum.

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