Created by StemPy LabTaking forward as positive, a car reverses out of a parking space: it moves backwards and gets faster. What is the sign of its acceleration?
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← A car's position on a straight test track is x = 0.4t² (SI units). A student works out its average velocity from t = 5.0 s to t = 5.1 s. What does she get, and what is the car's velocity at exactly t = 5.0 s?A driver moving at 18 m/s sees a cow on the road. She takes 0.8 s to react, and then brakes with a steady deceleration of 6 m/s². How far does the car go from the moment she sees the cow until it stops? →
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