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?
J
(c) What is the kinetic energy of the rock as it reaches the bottomof the hill?
J
(d) What is its speed then?
m/s