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Speed A + Speed B = Speed Combined
Unless they hit each other. Then, under Newton's Third Law, it's
(Speed A + Speed B) / 2 = Combined Collision Force
IE, if two cars hit each other head-on, both going 50mph, it's the same force as a single car hitting a wall at 50mph. (i.e. The impact force does not double; because you have to divide the absorption force of a second vehicle, which cancels out half of the force)
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