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April 18, 2014

April 18, 2014

Posted by **ice** on Wednesday, July 25, 2012 at 6:06am.

a) find the acceleration experienced by the driver of a car traveling at 50km/h if the car hits a pole and crumples 50cm.

b) repeat part a) for a car traveling 100km/h

- Physics -
**drwls**, Wednesday, July 25, 2012 at 8:01ama) Vo = 50 km/h = 13.89 m/s

T = "Crumpling time" = X/(Vo/2)

= 2*0.50 m/13.89 m/s = 0.072 s

(Vo/2 is the average speed of the car during crumpling)

Acceleration = Vo/T = Vo^2/(2X)

= 193 m/s^2

b) It is not reasonable to assume that the crumple distance will remain 50 cm at the higher speed. More information is needed.

- Physics -
**ice**, Wednesday, July 25, 2012 at 8:24amcan you explain it a bit clearer

- Physics -
**Elena**, Wednesday, July 25, 2012 at 3:38pmv=50 km/h =50000/3600=13.89 m/s

For accelerated motion

s=vₒt+at²/2 (1)

v=vₒ+at (2).

Final v=0 => t= -vₒ/a.

Substitute t in (1)

a= - vₒ²/2s= - (13.89)²/20.5=

= - 195.9 m/s²

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