Amoving freight car runs into an identical car at rest on the track. the cars couple together. compared to the velocity of the first car before the collision, the velocity of the combined cars after the collision is group of answer choices

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)