# Pumping rubber

One can work out by either lifting weights or using a tension band, which is like a big rubber band. If we model the rubber band as a big spring with spring constant $$400~\mbox{N/m}$$, how far in meters must I stretch the the band so it applies a force equivalent to the gravitational force on a $$10~\mbox{kg}$$ weight?

Details and assumptions

• The acceleration of gravity is $$-9.8~\mbox{m/s}^2$$.
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