Marty Bakerman is on a footbridge above the train tracks. He can see that the train approaching the bridge is out of control, and that it is going to hit five people who are stuck on the track just past the bridge. The only way to stop the train is to drop a heavy weight into its path. The only thing available is a person of sufficient size, who is also watching the train from the footbridge. Marty can push the person onto the track into the path of the train, which will kill the person but save five people already on the track, or he can allow the train to continue on its way, which will mean that the five will die. What would Kant say to do and why