A car starts from rest with a constant acceleration of 3.0 m/s^2. What is its velocity after 4.0 s?

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Multiple Choice

A car starts from rest with a constant acceleration of 3.0 m/s^2. What is its velocity after 4.0 s?

Explanation:
Constant acceleration means velocity changes by a t factor: v = v0 + a t. Starting from rest gives v0 = 0, so v = a t. With a = 3.0 m/s^2 and t = 4.0 s, v = (3.0)(4.0) = 12 m/s. The units work out as m/s from m/s^2 times seconds. So after 4 seconds the car’s velocity is 12 m/s.

Constant acceleration means velocity changes by a t factor: v = v0 + a t. Starting from rest gives v0 = 0, so v = a t. With a = 3.0 m/s^2 and t = 4.0 s, v = (3.0)(4.0) = 12 m/s. The units work out as m/s from m/s^2 times seconds. So after 4 seconds the car’s velocity is 12 m/s.

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