A Physics provincial Exame problem.

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A Physics provincial Exame problem.
A 45 kg steel ball is projected vertically with an initial speed of 280 m/s.While the is rising 8.5x10^5 J of heat energy are produced due to air friction.What is the maxiumum height reached by the ball?
顺便说一句正确答案是2100m

根据能力守恒就可以了：
开始的动能1/2*mv^2=热能+势能mgh
1/2*45*280^2=8.5*10^5+45*9.8h
得到结果为h=2072.56m

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