1. The problem statement, all variables and given/known data A car with a mass of 1200 kg and a speed of 70 km/h collides in a head-on collision with a motorcycle. The vehicles lock together and continue along with the speed of 45 km / h in the cars original direction. The motorcycle weighing 250 kg. What is the speed of the motorcycle before the collision? (The masses of both the are included in the weights given) 2. Relevant equations 3. The attempt at a solution Okay, I'm having a hard time with this one. I've tried to do something like this: m= 1200kg v= 70km/h = 19.4m/s 1200*19.4 = 23280N = 23.3kN 1200*19.4+250*x (why I tried something like this is because I had seen a similar problem being solved along these lines, but on that problem all the information was given, so I thought I could solve this by simply giving the motorcykle the speed of X. However I do not understand this at all, so I thought I'd come here and ask for help to put me into the right direction. I'd like to understand every answer I write and you guys are always to a great help.