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During a rockslide, a 760 kg rockslides from rest down a hillside that is 500 m long and 300 m high. The coefficient of kinetic friction between the rock and the hillsurface is 0.34.
(a) If the gravitational potential energy U ofthe rock-Earth system is set to zero at the bottom of the hill,what is the value of U just before the slide?
J
(b) How much energy is transferred to thermal energy during theslide?
(c) What is the kinetic energy of the rock as it reaches the bottomof the hill?
(d) What is its speed then?
m/s
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