Hooke's law

Elastic strings and springs, energy stored, and equilibrium / motion problems.

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Q1Direct calculation4 marks
An elastic string of natural length 2 m2\,\mathrm{m} and modulus 20 N20\,\mathrm{N} is stretched to 2.5 m2.5\,\mathrm{m}. Find the elastic potential energy stored.

Coach · attempt

Write something first. A wrong start still earns method marks later.