posted by Rebecca .
In a car crash, Car A rear ends Car B that stopped at a red light. After the crash, Car A and Car B meld together moving at a speed of 14 m/s. Car A has a mass of 1750 kg. Car B has a mass of 2000 kg.
Calculate the initial momentum of Car A.
So far I have Va=?
Ma= 1750 kg
Pf=52500 kg m/s
Pb= 0 kg m/s
Okay because the cars travel together afterwards this is an inelastic collision. SO you would need the formula
because car B is at rest it can be simplified to
Now you have all the values except Va, so first solve for Va
The when you find Va you can find the momentum
Since momentum is simply p=mv; just multiply Va and Ma