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QUESTION 3
The resistance to motion of a car is proportional to the square of its speed. The car has a mass of
1000kg and can maintain a steady speed of 30m/s when travelling up a hill inclined at arc sin to
the horizontal with the engine working at 60KW. Find the acceleration of the car when it is travelling
down the same hill with the engine working at 40KW at the instant when the speed is 20m/s.
20

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