A careless driver is coasting at 20 m/s (about 40 mi/h) along a straight, level road in a car of mass 1400 kg when she collides with a parked car. The parked car is in neutral, and its brakes are off. The two cars lock bumpers and move off together. If the final velocity is 10 m/s, what is the mass of the parked car? (a) 700 kg
(b) 1400 kg
(c) 2800 kg
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