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If there are no unknowns and you have the following information how would you determine if kinetic energy and momentum are conserved.

Mass 1 = 0.541 kg, Mass 2 = 0.541 kg, Vi 1 = 0.33 m/s, Vi 2 = 0, Vf 1 = 0, Vf 2 = 0.3 m/s.

All i need to know is if i should solve for Ekbefore first and then Ekafter or should i do Ekbefore=Ekafter that way all the masses and 1/2's cancel out. So which way is right.