1. The problem statement, all variables and given/known data A 92 kg fullback, running at 5.0 m/s, attempts to dive across the goal line for a touchdown. Just as he reaches the goal line, he is met head-on in midair by two 75 kg linebackers, one moving at 2.0 m/s and the other at 4.0 m/s. If they all become entangled as one mass, with what velocity do they travel? Does the fullback score? 2. Relevant equations Momentum = Mass x velocity P stands for Momentum Pbefore = Pafter 3. The attempt at a solution Here is what iv'e done so far. I want to make sure its right. First I added both of the momentums of the linebackers and then I subtracted that momentum from the fullbacker's momentum to get a difference of 10 kg m/s and then divided that by the total mass of the 3 players combined. P = M xv P = Mv1 + Mv2 P = (75)(2) + (75)(4) P = 150 + 300 P = 450 kg m/s Pfullback = 92 x 5 = 460 kg m/s Pchange = 460 kg m/s – 450 kg m/s Pchange = 10 kg m/s totalVelocity = totalMomentum/totalMass Velocity = 10 kg m/s / 242kg Velocity = 0.041 m/s Yes the fullback scores.