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ImmaGrump
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Homework Statement
A 4.50 ✕ 10^5 kg subway train is brought to a stop from a speed of 0.500 m/s in 0.900 m by a large spring bumper at the end of its track. What is the force constant k of the spring?
M- 4.50E5 kg
IV- .5m/s
FV- 0m/s
Homework Equations
k=mg/x
F=-kx
PE = (.5)kx^2
The Attempt at a Solution
k=(450000kg)(9.81m/s^2)/ .9 = 4900000, which isn't the right answer. Can someone help me out?
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