76. (a) At the point of maximum height, where y= 140 m, the vertical component of velocity vanishes but the horizontal component remains what it was when it was launched (if we neglect air friction). Its kinetic energy at that moment is Kvx=120552..kgbgAlso, its potential energy (with the reference level chosen at the level of the cliff edge) at that moment is U= mgy= 755 J. Thus, by mechanical energy conservation, KKUvix=−=−¡=−1550 755
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.