Harold the Hurler is a physics student who is renowned for his baseball pitching

Question

Harold the Hurler is a physics student who is renowned for his baseball pitching arm. In order to determine the amount of work her performs in throwing a baseball, Harold devises an experiment. He stands at the bottom of a deep pit and hurls a 142 g baseball through an open third floor window in a nearby building. Harold's aim is so accurate that the ball then smoothly enters the tube of the Baseball Absorber that Harold invented and patented. In this device the ball compresses a spring until it comes momentarily to rest, and the maximum amount of compression is recorded as 48.7 cm. The spring's force constant is 849 N/m and the position of the baseball's momentary rest is 7.17 m above ground level. The point in the pit where the Hurler starts his pitch is 13.5 m below ground level. How much work does Harold perform on the baseball? Take g=9.80m/s^2

Explanation / Answer

work done =change in energy =m*g*(13.5+7.17) +k*x*x/2 =.142*9.8*20.67 + 849*.487*.487/2 =28.76+ 100.67 =129.47 J

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