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February 28, 2015

February 28, 2015

Posted by **Brittany** on Thursday, December 9, 2010 at 5:10pm.

(a) If a car traveling 26.0 m/s stops uniformly in 1.20 m, how long does the collision last?

cannot_evaluate

s

(b) What is the magnitude of the average force on the car?

N

(c) What is the acceleration of the car? Express the acceleration as a multiple of the acceleration of gravity.

- Physics -
**drwls**, Thursday, December 9, 2010 at 6:01pm(a) t = (crumple distance)/(average speed)

= 1.20 m/13 m/s = 0.092 s

(b) (force)*(crumple distance) = initial kinetic energy = (1/2) M Vo^2

Solve for the force F

F = (1/2) M Vo^2/X

OR acceleration a = Vo/t = Vo^2/(2X)

and F = M a = M Vo^2/(2X)

(same result)

(c) I already solved for a. Divide it by g to get what they want

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