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I have been thinking on this problem

A car of mass450kgtravels east at4.5m/s, and collides with a550kgtruck infront of it traveling east at3.7m/s. What are their velocity after the elastic collision.

I know the energy formula and the momentum formula, and I know that when the energy formular is divided by the momentum formula, it came out that:

V1-V2=V'2-V'1

the ' sign means prime/final

But I can't figure it out anyway... due to my stupidity... because V'2 and V'1 is unknown.

Would anyone help me? If so, please explain to me how you would do it using the energy and momentum formula.

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# Momentum collision difficulty

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