4. A roller coaster reaches the top of the steepest hill with a speed of 6.40 km/h. It then descends the hill, which is at an average angle of 35° and is 47.0 m long. What will its speed when it reaches the bottom? Assume µk = 0.20. m/s 60 ssº $$f60% €60 ss? ssf644 f60

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Projectile Motion