Hi! I'm a sixteen year old grade eleven physics student,and I'm having trouble understanding impulse and momentum.I would like you to clear up a few things for me. "suppose two identical cars traveling at the same speed are brought to a stop: one by its braks, the other by a concrete abutment. In both cases the changes in momentum is the same. the cars have equal masses and experience an equal change in velocity. The impulse to stop each car must be equal too, because impulse and momentum are equivalent quantities. This is what it says in my text. I don't really understand it, could somone explane this to me? Thank you. Help!