Perfectly inelastic collision problem

  • Thread starter maxdaddy
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  • #1
maxdaddy
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Homework Statement



A 2000kg car moving east at 10 m/s collides with a 3000kg car moving north. They stick together and move as a unit after the collision, at an angle of 40 degrees north of east and at a speed of 5.22 m/s. Find the speed of the 3000kg car before the collision.

Homework Equations


Pi=Pf
mivi + mivi= mfvf + mfvf


The Attempt at a Solution


I tried plugging the numbers in the above equation but it did not work. The textbook gives the answer of 5.59 m/s and I cannot figure it out. Somebody give me some help please.
 

Answers and Replies

  • #2
Doc Al
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Since momentum is a vector you can break it into components. Write a separate conservation equation for east/west and north/south components. Once you have the components of the car's initial velocity, use them to find its speed.
 

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