A driver notices that her l000 -kg car slows from v0 = 90.0 km/H (25.0 m/s) to v = 70.0 km/h (19.4 m/s) in t = 6.00 s moving on level ground in neutral gear. Calculate the power needed to keep the car moving at a constant speed, v ave = 80.0 km/h (22.2 m/s).
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