Professional baseball pitchers can deliver a pitch which can reach the blazing s

Question

Professional baseball pitchers can deliver a pitch which can reach the blazing speed of 100 mph (miles per hour). A local team has drafted an up-and-coming left handed pitcher who can consistently throw at 91.00 mph. Assuming the ball has a mass 142.0 g and has this speed just before a batter would make contact, how much kinetic energy does the ball have?

Kball = _______________ J

How high would the ball need to be dropped from to attain the same energy (neglect air resistance)? (The acceleration due to gravity is 9.81 m/s2.)

hball = ______________ m

Explanation / Answer

91 mph=40.68 m/s so a) Kball=.5*m*40.68^2=117.5 b)mgh=.5*m*v^2 so h=84.4 m

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