Suppose you have two pucks on flat ice. Puck A has mass 0.150kg and puck B has mass 0.110kg. The coefficient of kinetic friction on the ice for pucks is 0.040. Puck B is initially at rest. Puck A hits puck B head-on (don't assume elastic though). If after the collision puck A slides 18m and puck B slides 30m, what was puck A's initial velocity right before the collision?

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