ANSWERS: 1
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The train is much more massive and thus (at the same speed) has most of the system's momentum. Since total momentum is conserved, after the crash it will still be in the direction the train was traveling, with just a little lower speed. The occupants of the train have only undergone a little acceleration (well, deceleration is negative acceleration) so maybe they're just shaken up, or barely even felt a bump. The occupants of the car have stopped going forward and started going backward, all during the brief time of the crash. Hence their instantaneous acceleration is very high, which is what causes them to splatter. It's worse than hitting a brick wall, where final speed only goes to zero instead of negative!
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