- #1
runningirl
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Homework Statement
Lois Lane has been tied to the tracks and the Metropolis Express (m=200, 000 kg) is racing toward her at a velocity of +30 m/s. Superman (m=100kg) arrives just in time and comes hurtling at the train, collides with it, and stops it just before it runs over Lois. NOTE: Both Superman and the train come to a stop.
a)What was Man of Steel's velocity prior to his collision with the train?
b) It took 0.20 seconds for the train, and Superman, to come to a stop, what was the average force exerted by Superman on the train?
c) What was the average force exerted by the train on Superman?
Homework Equations
The Attempt at a Solution
i thought for part a:
200000(0)+100(v)=200000(30)+100(0)
v=6000 m/s?! it doesn't make sense..
part b)
J=Fave(t)
P=m(V)
100(v)=Fave(.2)
I realized i had to find Superman's velocity...