Question

A roller coaster reaches its maximum kinetic energy when it

reaches the bottom of a hill.

begins rolling down a hill.

is sitting at the top of a hill.

is starting up a hill.

Answer 1

Reaches the bottom of the hill.

Answer 2

Thanks!!! What is true about energy?

Energy cannot be created during an ordinary chemical reaction.

Energy is used up during an explosion.

There is more energy after a chemical reaction than before the reaction.

When water melts, energy is created in the form of heat.

Answer 3

Energy cannot be created during an ordinary chemical reaction. Normal reactions only change the type of energy from one form or another. Only through complex experiments can you actually create energy, which is created from mass. A good example is the atom bomb dropped on Japan in WW2. This was figured out thanks to the great insight on the equivalence principle, which Einstein himself deduced. You should have heard this equation quite a bit throughout school:
\[E=mc ^{2}\]

Answer 4

Oh okay! Thanks again