KE = (1/2) m v^2
You must do enough work (Force times braking distance) to equal the original Kinetic energy.
W1 = (1/2) m v^2
W2 = (1/2) m (3v)^2 = (1/2) m v^2 * 9
so
nine times as much
Two cars have the same mass, but one is moving three times faster than the other. How much more work will be needed to stop the faster car?
2 answers
I guess NINE TIMES AS MUCH