A real world roller coaster released at point A and coasting without external po

Question

A real world roller coaster released at point A and coasting without external power would traverse a track somewhat like the figure below. Friction is not negligible in the real world. Does the roller coaster have the same energy at points B and C? Is the total energy conserved during the coaster ride? Can you account for all the energy at any point on the truck?

Note: Im a little confused when it says Friction is not negligible, does that mean we take friction into consideration or we dont?

Explanation / Answer

no the energy is decreasing as the roller coaster moves forward because of friction friction does negative work on it and therefore absorb some of the energy. A>B>C

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