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10 The acceleration of a car is zero when it is (a) turning right at a constant speed, (b) driving up a long straight

10 The acceleration of a car is zero when it is (a) turning right at a constant speed, (b) driving up a long straight incline at constant speed, (c) traveling over the crest of a hill at constant speed, (d) bottoming out at the lowest point of a valley at constant speed, (e) speeding up as it descends a long straight decline.

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