9th grade physical science
posted by robbie .
a the top of a hill a rollercoaster has 67,500j of kinetic energy and 290,000j of potential energy. gradually the roller coaster comes to a stop due to friction. if the roller coaster has 30,000j of potential energy when it stops, how much heat energy is generated by friction from the top of the hill until ot stops ?

1.85x103 cm x 5.22 x102 cm in scientific notation

gases in earth's atmosphere exert______________ on everything

327500
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