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An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 5.6× 104 kg, and the force causes its speed to change from 7800 to 5600m/s.

(a) What is the work done by the force?

(b) If the asteroid slows down over a distance of 1.3× 106 m determine the magnitude of the force.

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