Homework Help: Physics

Posted by Savannah on Monday, September 18, 2006 at 8:37pm.

A car with good tires on a dry road can decelerate at about 5.0m/s/s when braking. If the car is traveling at 55miles/hour, how much time does it take the car to stop?

55 mph = 80.7 ft/s = 24.6 m/s
Divide the initial speed by the deceleration rate to get the time required.
(24.6 m/s)/(5.0 m/s^2) = ? seconds

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