Posted by Isis on .
1.) A 10,000 kg railroad car traveling at a speed of 24.0 m/s strikes an identical car at rest. If the cars lock together as a result of the collision, what is their common speed afterward?
2.) A 3.0 kg ball at 3 m/s and strikes a 1.5 kg ball moving at 2 m/s. After the collision, the 1.5 kg ball moves to the right at 2 m/s. What is the final velocity of 3.0 kg ball?
3.) A 85 kg running back is moving at +12 m/s and strikes a 125 kg linebacker moving at 8.0 m/s. What is the final velocity if they stick together?
Formula: m1vi+m2vi=m1vf+m2vf
:) help me please!!!
No one has answered this question yet.

Physics ~ CONSERVATION OF MOMENTUM ~ 
bobpursley,
1. the final momentum is (M1+M2)V
2. just do the math.
3. same as 1, if they stick together, final momentum (85+125)V solve for v.