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Q. Sam, whose mass is 60 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 280 N and a coefficient of kinetic friction on snow of 0.15. Unfortunately, the skis run out of fuel after only 15 s.

Q. A rock of mass 47 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. What is the magnitude of the acceleration of the rock

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