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A roller coaster enters the bottom of a circular loop with just the right speed such...

A roller coaster enters the bottom of a circular loop with just the right speed such that its speed at the top of the loop momentarily is zero. As the name suggests, the roller coaster is coasting through the loop, that is there is no motor actively propelling the roller coaster. Also, ignore friction. What can you say about the direction of the acceleration of the roller coaster as it is halfway up the loop (in the 3-o-clock position of the circle)?

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