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Question
What kind of work is done when the driver of a speeding car applies brakes?
Short Answer
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Solution
The braking force acts opposite to the car’s displacement. Therefore, the angle between force and displacement is 180°, so (W = FS cos 180° = −FS). Hence, the brakes do negative work on the car.
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Chapter 2: Work, Power and Energy - EXERCISE [Page 30]
