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If the work required to speed up a car from 10 km/h to 20 km/h is 5.0 X 10^3 J, what would be the work required to increase the car’s speed from 20 km/h to 30 km/h? the answer is 8 x 10^3 J

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1/2 m(20^2 - 10^2) = 5000
solve for m, and then
1/2 m(30^2 - 20^2) = ____ J

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