Question

A pig slides down a 29° incline in twice the time it would take to slide down a frictionless 29° incline. What is the coefficient of kinetic friction between the pig and the incline?
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calculation on physic: a tractor of mass 5.0×10^3kg is used to tow a car of mass 2.5×10^3kg. the tractor moved with a speed of 3.0m/s just before the towing rope becomes taut. calculate the speed of the tractor immediately the rope becomes taut?

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