A 2 kg rock is released from rest at a height of 29m. ignore air resistance and determine the kinetic energy,gravitational potential energy, and total mechanical enerfy at eachof the followinf heights: 20m; 15m, 5m;9m.
Globokim8
Answered question
2020-11-08
Answer & Explanation
sweererlirumeX
Skilled2020-11-09Added 91 answers
E = m g h = 2 x 9.8 x 29 = 568.4 joules. By conservationof energy, 568.4 is the total mechanical energy at everyheight.
As the rock falls and loses potential energy, this potentialenergy is converted to an equal amount of kinetic energy. Calculate PE using m g h at each height.
20 m: PE = 392, KE = 176.4
15 m: PE = 294, KE = 274.4
5 m: PE = 98, KE = 470.4
9 m: PE = 176.4, KE = 392
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