michelle is peadling down a steep hill on her bicycle and wants to be ablet to coast up the next hill which is 25.0 meters high, without pedaling up the hill at all. assuming her bicycle is 100% efficient her speed would be at least​

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)