Posted by Bob on Thursday, May 10, 2012 at 7:21pm.
PE=€mgh=1200 * 9.8 * 24=282,240 Joules.
KE = 0.
PE + KE = 282,340 J.
PE = 1200 * 9.8 * 12=141,120 J. @ 12 m.
141,120 + KE = 282,240
KE = 282,240 - 141,120 = 141,120 J.
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