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?

Answer 1

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