Homework Help: physical sciencei

Posted by tracey on Wednesday, September 19, 2012 at 4:25pm.

is the work needed to bring a car's speed from 0 to 10 km/h less than, equal to or more then the work needed to bring its speed from 10 to 20 km/h? if the amounts of work are different, what is the ratio between them?

physical sciencei - maria, Friday, September 21, 2012 at 3:07pm
ke=1/2 (mass)(velocity)
ke=1/2mv^2
ke= 1/2m(10^2-0^2) ke=1/2m(20^2-10^2)
ke=1/2m(100) ke=1/2m(400-100)
ratio is 300/100 or 3/1

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