Posted by tracey on .
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,
ke=1/2 (mass)(velocity)
ke=1/2mv^2
ke= 1/2m(10^20^2) ke=1/2m(20^210^2)
ke=1/2m(100) ke=1/2m(400100)
ratio is 300/100 or 3/1