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Q. A 100kg crate is being pushed across a horizontal floor by a force P that makes an angle of 30 below the horizontal. The coefficient of kinetic friction is 0.20. What must be the magnitude of P, so that the net work completed by it and the kinetic frictional force is zero?

Q. A car is travelling at 50km/h on a flat highway. If the coefficient of friction between the road and the tires on a rainy day is 0.100, what is the least distance required for the car to stop?

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