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The barricade at the end of a subway line has a large spring designed to compress 2.00 m when stopping a 1.60 ? 105 kg train moving at 0.300 m/s.
(a) What is the force constant of the spring?
(b) What speed would the train be going if it only compressed the spring 0.900 m?
(c) What force does the spring exert when compressed 0.900 m?(in the direction opposite to the train's motion)
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