(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A physics book is thrown @ 12 km/h [N 28 E] mass = 1.54 kg

and a chemistry book @ 9 km/h [N 65 W]; mass = 1.82 kg

if they collided in an elastic collision find final velocities of each book.

2. Relevant equations

those two momentum-energy conservation formulas.

3. The attempt at a solution

so, I assumed that frame of ref. is moving @ 9 km/h [N 65 W]

and then found relative velocities, and using those two formulas find the velocities of both books, and again converted the final relative velocities to original vs.

and got 9.75 km/h [N59 W] for the physics book, and 11.07 km/h [N 32 E] for the chemistry book.

I am not sure about my answers cuz I had to do many calculations,and if you can check them for me?

<is there an easier way to solve such problems?

I was wondering about center of mass thing, but I did not try using that way because I really dunn know if that would be an easier way and also I dunn even know how to find the velocity of the center of the mass of this system>

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# Homework Help: A complex momentum problem

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