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What was the speed of the lighter car?

______ km/h

What was the speed of the heavier car?

______ km/h

I know this is a perfectly inelastic collistion and that Vf will be equal.

so x-dir m1vi1 = (m1 + m2) Vf cos 30

y-dir m2vi2 = (m1 + m2) Vf sin 30

so i can't solve too many unknowns.

How do i use the 25m and kinetic friction??