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(a) What are the velocities of both automobiles immediately after the collision?

I assume the equation 1/2m1v1^2+1/2m2v2^2=1/2m1v'1^2+1/2m2v'2^2 is applied but I dont know what to do without velocity.

(b) After the collision, the first automobile continues to roll downhill, with acceleration, and the second automobile skids downhill, with deceleration. Assume that the second automobile skids with all its wheels locked, with a coefficient of sliding friction 0.90. At what time after the first collision will the automobiles have another collision, and how far from the initial collision?