Problem: A 350 kg roller coaster starts from rest at point exttip{A}{A} and slides down the frictionless loop-the-loop shown in the accompanying figure.How fast is this roller coaster moving at point exttip{B}{B}?How hard does it press against the track at point exttip{B}{B}?

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A 350 kg roller coaster starts from rest at point and slides down the frictionless loop-the-loop shown in the accompanying figure.

How fast is this roller coaster moving at point ?

How hard does it press against the track at point ?