A 1.62 m wide, 1.38 m high, 1500 kg car hits a very slick patch of ice while going 20.0 m/s. Air resistance is not negligible. If friction is neglected, how long will it take until the car's speed drops to 18.0 m/s? If friction is neglected, how long will it take until the car's speed drops to 10.0 m/s?