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A load of B0 N applied to a spring of length 40 cm extends it by 20 mm. Assuming that
the proportional limit is not exceeded, calculate the following:
a the force constant of the spring
b the length of the spring when a load of 40 N is applied
c the potential energy stored in the spring when the extension is 20 mm. (A simple
sketch graph of force against extension can help you here.)

Sagot :

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