2009-12-14, 02:52 PM
studying for physics exam, I stumple upon this equation on the textbook that doesn't make sense:
first it says:
m1(v1i-v1f)=m2(v2f-v2i)
then it says:
m1(v1i^2-v1f^2)=m2(v2f^2-v2i^2)
I don't get how they come up with the 2nd equation...
first it says:
m1(v1i-v1f)=m2(v2f-v2i)
then it says:
m1(v1i^2-v1f^2)=m2(v2f^2-v2i^2)
I don't get how they come up with the 2nd equation...

