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.