You find yourself at a lever. a runaway trolley approaches five people who are tied to a set of tracks. pulling the lever will divert the trolley to a different set of tracks, where only one person is tied down do you pull the lever?

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.