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GRE Physics 8677 Question 5

A particle is initially at rest at the top of a curved frictionless track. The x- and y-coordinate of the track are related in dimensionless units by y = x²/4, where the positive y-axis is in the vertical downward direction. As the particle slides down the track, what its tangential acceleration?

I was sick when recording, so my voice would be more weird.

I changed mic though.

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