Superman stopping a train physics question?

1) Find the speed at which Superman (mass=82.0 kg) must fly into a train (mass = 18862 kg) traveling at 85.0 km/hr to stop it.



2) Running into the train at that speed would severely damage both train and passengers. Calculate the minimum time Superman must take to stop the train, if the passengers experience an average horizontal force of 0.460 their own weight.



3) How far does the train then travel while being slowed to a stop?Superman stopping a train physics question?1) 82*v-18862*85/3.6=0

solve for v

v=5431.13 m/s

or

19552 km/hr

(that's why he's superman)



2)

a=0.460*g



0=85/3.6-0.460*g*t

t=5.23 seconds



d=85*5.23/3.6

123.5 m

==============Superman stopping a train physics question?The area of superman's hands that come in contact with the train is so small in comparison with the train surface, it is physically impossible to stop a train within a short distance. Superman will certainly go through the train like a bullet. If he is very careful and has a lot of time on his hands he might be able to bring the train to a stop eventually.Superman stopping a train physics question?This is Superman that your talking about, not Spider-man. So normal physics don't apply. Here's what will happen in "the runaway train" scenario...



Superman will just fly further and wait for the train to come at him. When he made contact with the train he'll just fly and carry the whole train with him stopping the train from being able to go forward again. Than he can put the train down anywhere. So the answers are:

1. 0 km/h.

2. 1-2 minutes. 5 minutes tops.

3. 0 mm (since he can put the train anywhere, so he can just put it back from the start).