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 92.00 mph. Assuming the ball has a mass 144.0 g and has this speed just before a batter would make contact, how much kinetic energy does the ball have?
K=_______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.)
h=________m

Explanation / Answer

Convert everything to metric units. A) for kinetic energy, K = m * (v ^ 2) / 2 B) for potential energy, K = m * g * h m = mass of ball (grams) v = ball velocity (meters/second) g = gravitational acceleration (meters/second^2) h = ball height (meters)

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