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The velocity at the top of the first hill was 21 m/s.

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David Denton

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Q: The height of the first hill is 25.9 meters, and the height of the second hill is 14.4 meters. The track of the rollercoaster is frictionless. If the rollercoaster car's velocity is 21 m/s, what was its velocity at the top of the first hill?
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