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Q. A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 8.4 m/s. If the coefficient of friction between the sled's runners and snow is 0.040 and the boy and sled together weigh 700 N, how far does the sled travel on the level surface before coming to rest?

Q. what are the magnitudes of (a) the angular velocity, (b) the radial acceleration, and (c) the tangential acceleration of a spaceship taking a circular turn of radius 3220 km at a speed of 29000 km/h?

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