Question 231661
Superman slams head-on into a locomotive speeding along at 62 km/h, bringing it smoothly to rest in an amazing 1/1000 s and saving Lois Lane, who was a mere 11 cm down the tracks from the point where Superman struck the train. How far away from her did the "Man of Steel" finally stop the engine?
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The train went from 62 to zero in 1/1000 of a second, so its average speed for that millisecond was 31 km/hr = 31000 m/hr = 3100000cm/hr
1 hour = 3600 seconds
3100000 cm/hr = 3100000/3600 cm/sec
d = rt = (3100000/3600)*0.001 cm
d = 31/36 cm traveled after impact
11 - 31/36 = 10 5/36 cm from Lois
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The acceleration from (62000/3600) m/sec to zero in 1 millisecond is
~ 1757 g's.  Doesn't sound "smooth" to me.