If a car accelerates from rest to 20 m/s in 5 seconds, what is its average acceleration?

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Multiple Choice

If a car accelerates from rest to 20 m/s in 5 seconds, what is its average acceleration?

Explanation:
Acceleration is the rate at which velocity changes. Here, the car starts from rest (0 m/s) and reaches 20 m/s in 5 seconds, so the average acceleration is the change in velocity divided by the time: (20 − 0) / 5 = 4 m/s^2. The final velocity change is 20 m/s over 5 seconds, which gives 4 m/s^2. If the acceleration were 3, 5, or 2 m/s^2, the velocity change over 5 seconds would be 15, 25, or 10 m/s respectively, not 20 m/s, so those values don’t fit the given data.

Acceleration is the rate at which velocity changes. Here, the car starts from rest (0 m/s) and reaches 20 m/s in 5 seconds, so the average acceleration is the change in velocity divided by the time: (20 − 0) / 5 = 4 m/s^2. The final velocity change is 20 m/s over 5 seconds, which gives 4 m/s^2. If the acceleration were 3, 5, or 2 m/s^2, the velocity change over 5 seconds would be 15, 25, or 10 m/s respectively, not 20 m/s, so those values don’t fit the given data.

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