Since F=k∆x, F/∆x is constant. So, if the unstretched length is Lo,
8/(76-Lo) = 14/(85-Lo)
Lo = 64 cm
a load of 8 kg attached to the bottom of a coil spring stretches the spring to a length of 76 cm and a load of 14 kg stretches it to a length of 85cm. find the natural(unstretched)length of the spring
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