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

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

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