tte RBER-PAYS 1321-Hall?-BLANTOActivities and Due Dates HW: Work and Energy 24/2

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tte RBER-PAYS 1321-Hall?-BLANTOActivities and Due Dates HW: Work and Energy 24/2017 06:00 PM 24.3/100 10/22/2017 07:57 PM Gra. Print Calculatr Penodic Table n 22 of 30 Sapling Learning Map Professional baseball itchers can deliver a pitch which can reach the blazing speed of 100 mph (miles ger hour). A local team has drafted an up-and-coming left handed pitcher who can consistently throw at 95 mph. Assuming the ball has a mass 143.6 g and has this speed just before a batter would make contact, how much kineic energy does the ball have Number 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) Number O Previous Give, up & Varw 5cluten Check Answer O Next Ext

Explanation / Answer

v = 95.50 mph = 95.50 x 1609 m / 3600 s

v = 42.68 m/s

K = m v^2 / 2 = (0.1436) (42.68^2) / 2

K = 130.8 J .........Ans

K = m g h

130.8 = 0.1436 x 9.81 x h

h = 92.9 m .......Ans

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