4
lesson pretestMultiple Choice

Pretest

Question 4 • Physics I

Which formula can be used to calculate the horizontal displacement of a horizontally launched projectile?

Answer
A
triangle x is equal to v sub i times cosine theta
B
triangle x is equal to A sub y triangle t
C
triangle x is equal to v sub i sine theta triangle t
D
triangle x is equal to v sub x triangle t

Explanation

Horizontal displacement is found by multiplying horizontal velocity by the time traveled: Δx = vₓΔt. For a horizontally launched projectile, the horizontal velocity remains constant, so choice B, “Δx = vₓΔt,” is correct. Choice A gives only a velocity component, not a displacement.

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