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a? very small bus with a mass of 500kg and the initial speed of 0m/s travels...

a? very small bus with a mass of 500kg and the initial speed of 0m/s travels down a slope. the horizontal distance of the slope is 80m long and starts at 30 m above the end point. the average friction force is 400N. what is the speed (m/s) of the bus if it arrives at the bottom of the slope?

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