A car moving south speeds up from 10 m/s to 40 m/s in 15 seconds. What is the car’s acceleration?

Acceleration is the change in velocity divided by the time: (40 m/s − 10 m/s) ÷ 15 s = 2 m/s². Since the car is speeding up while moving south, its acceleration is southward. The correct choice is 2 m/s².

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