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University of Arkansas-x ww.saplinglearning.com/ibiscms/mod/ibis/view.php?id- 5081692 arning niversity of Arkansas-Little Rock-PHYS 2321-Springi8-CHEN Activities and Due Dates HW: Work and Kinetic Energy 3/9/2018 06:00 PM0332/10003/6/2018 02:46 PM Gradeba Score Question 7 of 7 a Sapling Learning Sir Dudiey the Dextrous is loading cannons on top of the castie's talest towers in preparation for an expected attack. He slips, and a 14.0 kg cannonball rolls to the edge of the tower (which has a perfecty horizontal surface), and faills lo the below. It takes the cannonball 2.15 seconds to fall to the ground, and air resistence is negligible. How much work is done by gravity on the falling cannonbal? Number the fall, what is the average power transfer to the cannonball due to the force of gravity? Number check Aman, 0'.-.. Erit O Prevnas @i,. ".skVew ,, . e web and Windows

Explanation / Answer

a) h = 1/2 g t2 = 1/2 * 9.8 * 2.152 = 22.65 m

W = m g h

= 14 * 9.8 * 22.65

= 3107 J

b) Power = W / t = 3107 / 2.15

= 1445 W

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