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Baseballs pitched by a machine have a horizontal velocity of 30 meters/second

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Baseballs pitched by a machine have a horizontal velocity of 30 meters/second. The machine accelerates the baseball from 0 meters/second to 30 meters/second in 0.5 seconds. If a baseball has a mass of 0.15 kilograms, the force the machine exerts is  newtons. Use F = ma, where a=v−ut.