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Velocity after the collision

  • #1

Homework Statement



a 480kg car moving at 14.4m/s hits a another car from behind moving at 13.4m/s in the same direction. if the second car has a mass of 570kg and a new speed of 17.9m/s what is the velocity of the first car after the collision??

Homework Equations



m1*v1=m2*v2
doubt thats it

The Attempt at a Solution


i know its 8.94m/s but why??
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
7
You have to use the law of conservation of linear momentum. According to this law, the total momentum before collision is equal to the total momentum after collision..
So m1u1 + m2u2 = m1v1 + m2v2.
 

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