Answer:
The kinetic energy and potential energy lost to friction is 2,420 J.
Explanation:
Given;total mass, m = 40 kginitial velocity of the girl, Vi = 5 m/shight of the hill, h = 10 mlength of the hill, L = 100 minitial kinetic energy of the girl at the top hill:initial potential energy of the girl at the top hill:Total energy at the top of the hill:E = 500 J + 3920 JE = 4,420 JAt the bottom of the hill:final velocity = double of the initial velocity = 2 x 5 m/s = 10 m/shight of the hill = 0final kinetic energy of the girl at the bottom of the hill:final potential energy of the girl at the bottom of the hill:Based on the principle of conservation of energy; the sum of the energy at the top hill = sum of the energy at the bottom hillThe energy at the bottom hill is less due to energy lost to friction.
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