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November 25, 2014

November 25, 2014

Posted by **Anonymous** on Monday, February 25, 2008 at 5:36pm.

The parachute on a race car that weighs 8042 N opens at the end of a quarter-mile run when the car is traveling 35 m/s. What net retarding force must be supplied by the parachute to stop the car in a distance of 1020 m? Answer in units of N.

- Physics still don't get it -
**Damon**, Monday, February 25, 2008 at 6:03pmm = weight in Newtons/ 9.81

Change in kinetic energy = average force * distance.

The change in KE is all the KE, since it stopped.

(1/2) m v^2 at the start = F * 1020

So F = (1/2) m v^2 / 1020

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