A car traveling north at 10.0 m/s crashes into a car traveling east at 15 m/s at an unexpectedly icy intersection. The cars lock together as they skid on the ice. The two cars have the same mass. What is their combined speed after the collision?
Am I wrong in assuming I cannot come to a proper answer without both the mass and velocity of each vehicle?
Normally I'd just split the momentum of each car into x and y components of the combined force, and use the combined force with the combined mass to find the final combined velocity. Or is there another way to do this?

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m1v1+m2v2 = (m1+m2)v3
is the formula for this if i recall it right

but since m1=m2 we can factor them out as:
(m)(v1+v2) = mv3

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