In a comic strip, Superman extends his arm and brings a large speeding train to a stop before it reaches his torso. To see if this is consistent with the principles of physics, assume that the truck is moving a constant speed of 30.0 m/s and that the mass of the train is 50,000 kg. Superman has a mass of 1.00 x 10^2 kg. If the force he exerts is limited by the frictional forces between his feet and the ground and mu s = mu k = 1.0, what is the minimum distance he needs to stop the train? (The engineer of the train does not use his brakes.)