On Oct 4, 12:28*pm, "dennis@home" wrote:

have you worked out why it takes four times as long to stop a car that is
going twice as fast yet.
You can use either formula to find out as the constant doesn't matter.

Asked an answered. You claimed it takes 4 times as long to stop a car
that's going 20 mph vs. one that's going 10 mph. My answer: no it
doesn't. A normal car will take twice as long.