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A softball, of mass m = 0.195 kg, is pitched at a speed v0 = 27.3 m/s. Due to air resistance, by time it reaches home plate it has slowed by 10.1 percent. The distance between plate and pitcher is d = 13.1 m. compute the average force of air resistance, Fair, that is exerted on the ball during its movement from pitcher to the plate.

Question2

A policeman investigating an accident measures skid marks left by a car. He determines that distance between the point that the driver slammed on the brakes and the point where a car came to a stop was 28.0 m. From a reference manual he determines that coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was car going when the driver apply the brakes?

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