I am trying to figure out a homework problem and the helpgiven on the website is

Question

I am trying to figure out a homework problem and the helpgiven on the website is flawed: I'm having a problem settingup this answer because of the two unknown variables. Here isthe problem: A 861 kg car stopped at an intersection is rear ended by a1420 kg track traveling at 12.5 m/s. If the car was inneutral and the collision was approximately elastic, find the finalspeed of both vehichles at the collision. I have been trying to figure this one out by usingconservation of momentumm1v1+m2v2=m1v1f+m2v2fand since initially car one doesn't have a velocity, we letm1v1=0, then leaving us withm2v2=m1v1f+m2v2f. I don't know how to solve this once I get here. Please helpme. Thank you! Lisa M I am trying to figure out a homework problem and the helpgiven on the website is flawed: I'm having a problem settingup this answer because of the two unknown variables. Here isthe problem: A 861 kg car stopped at an intersection is rear ended by a1420 kg track traveling at 12.5 m/s. If the car was inneutral and the collision was approximately elastic, find the finalspeed of both vehichles at the collision. I have been trying to figure this one out by usingconservation of momentumm1v1+m2v2=m1v1f+m2v2fand since initially car one doesn't have a velocity, we letm1v1=0, then leaving us withm2v2=m1v1f+m2v2f. I don't know how to solve this once I get here. Please helpme. Thank you! Lisa M

Explanation / Answer

as for a elastic collision coefficient of restitution is 1 we have 12.5=v2f-v1f    velocity of approach= velocity of separation so this is it we can solve for more help post a message

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