Consider a system to be two train cars traveling toward each other. What is the total momentum of the system before the train cars collide? kg • m/s What must the total momentum of the system be after the train cars collide? kg • m/s.

Prompta snowboarder stands at the top of a hill and decides to see if he can increase his speed on his next trip down the slope.describe one thing the snowboarder could do to incrlase his speed on the slope. explain why this would cause his speed toincrease relate one of newton's laws to this problem.

An atom that has gained or lost electrons is called an _

Aprotein molecule in an electrophoresis gel has a negative charge.the exact charge depends on the ph of the solution, but 30 excesselectrons is typical. what is the magnitude of the electric forceon a protein with this charge in a 1500 n/c electric field?