Conservation of momentum of a boxcar

[kmax12]

A 9700 kg boxcar traveling at 18 m/s strikes a stationary second car. The two stick together and move off with a speed of 8.0 m/s. What is the mass of the second car?



p=ma



is 21825 m/s the answer? sig figs?

 

[BuBbLeS01]

its asking for mass...

 

[pinkyjoshi65]

Ok, so this is an example of completely inelastic collision- that means that the 2 bodies will have the same final velocity. Use the formula for the final velocity, and find the mass of the car. Did that help?

 

[Anadyne]

P=mv

P = momentum, m=mass, v=velocity...