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A sled and rider (combined mass of 78 kg) finish a downhill run with a speed...

A sled and rider (combined mass of 78 kg) finish a downhill run with a speed of 26 m/s, then enter a flat (horizontal) area where the sled slows down at a constant rate of -2.2 m/s2 until it stops. What distance did the sled move while slowing down?

Your answer should be in m, but enter only the numerical part in the box.

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