HELP PLEASE When a train car traveling at 4 m/s collides with a stationary train car, what happens to the momentum of the first train car?
A. The first train car stops and the second train car stops.
B. The momentum is split between both train cars.
C. The first train car stops and the second train car moves then stops.
D. The first train car stops and its momentum is transferred to the second train car.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?