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A roller coaster reaches the top of the steepest hill with a speed of 6.7 km/h...

A roller coaster reaches the top of the steepest hill with a speed of 6.7 km/h . It then descends the hill, which is at an average angle of 44 ∘ and is 44.5 mm long.

What will its speed be when it reaches the bottom? Assume μk = 0.18.

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