Which of the following is used to calculate the velocity of two moving freight cars, after they collide and move together, given the initial masses and velocities of the freight cars?

it would be kevlar ^^

a. spokes of a wheel.

as indicated in the question radial contains rad, also found in radius, so the fracture's would span the radius.

i dont have a visual in front of me, but i can you reason to try to get the right one. the graph should look like this, 0 to 6 there is a spike, 12 to 14 there should be a very low point. slight increase in the graph at 12 to 14, and flat 14 to 18

explanation: