Multiply 6.5*10^3 J by the ratio
[35^2 - 20^2]/[20^2 - 13^2]
That is the ratio of the kinetic energy increases in the two cases.
If the work required to speed up a car from 13 km/h to 20 km/h is 6.5×103 J, what would be the work required to increase the car’s speed from 20 km/h to 35 km/h?
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