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anonymous
 4 years ago
A 30 kg child and sled slides down a 9.0 meter high hill. It is going a speed 12 m/s at the bottom of the hill. How much mechanical energy was transformed into thermal energy?
A 360 J
B 490 J
C 2160 J
D 2646 J
anonymous
 4 years ago
A 30 kg child and sled slides down a 9.0 meter high hill. It is going a speed 12 m/s at the bottom of the hill. How much mechanical energy was transformed into thermal energy? A 360 J B 490 J C 2160 J D 2646 J

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0as the sleigh goes down, gravitational potential energy is converted to kinetic energy. hence if you find potential energy  kinetic energy, ur answer should be right about 490

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0how do u know u subtract?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Energy transferred( P.E) = work done ( K. E.) + heat energy.. potential energy is converted (transferred) to kinetic energy as the sleigh glides down the slope.. there must be some kind of friction opposing the motion but it is negligible i suppose. As it slides down, kinetic energy is increasing because its gaining velocity. hence the lossed energy is converted to heat since energy cannot be created or destroyed. Law of conservation of energy

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ohhh okay i think i get it lol
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