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Q. An empty sled of mass 25kg slides down a muddy hill with a constant speed of 2.4 m/s. the slope of the hill is inclined at an angle of 15 degrees with the horizontal. calculate the time it takes the sled to go 21m down the slope.

Q. A 1700 kg car traveling at a speed of 23 m/s skids to a halt on wet concrete where f_k 0.50. How long are the skid marks?

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