7.12 | Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a

(a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop). (b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a).
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[@evanyu7320]

thanks dad

[@GlaserTutoring]

You got it!

[@jimenabravo5657]

AGAIN, THANK YOU!!!!!

[@GlaserTutoring]

You got it, Jimena! Keep studying hard! 😀

[@krystyhawk6228]

I was using simply KEcar = 1/2mv^2 and Wstop=F*d*cos180
I set KEcar = Wstop and solved for F
Then for part 2 I used a different "d" value, but the same equation setup.
My method doesn't account for acceleration. Thank you for showing that.
Nice drawings for the free body diagrams.

[@loden5677]

Same here, I used Wnet = deltaKE and therefore: deltaKE / d = F

[@zachsalisbury9771]

@@loden5677 I think thats a better approach to this problem

[@goranmalmsten5306]

12(a) Are the wheels locked (not rotating)?