A 6000 kg freight car rolls along rails with negligble friction. The car is brought to rest by a combination of 2 coiled springs. Both obey Hooke's law with k1=1600 N/m and k2=3400 N/m. After the first spring compresses a distance of 30 cm, the second springs acts with the first to increase the force as additional compression occurs in the graph.(adsbygoogle = window.adsbygoogle || []).push({});

The car comes to rest 50 cm after first contacting the 2 spring system. Find the car's initail speed.

I have no idea on how to do this problem.

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# Homework Help: Work don by a spring problem

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