A light elastic string of natural length 0.4 m has one end \(A\) attached to a fixed point. The other end of the string is attached to a particle \(P\) of mass 2 kg . When \(P\) hangs in equilibrium vertically below \(A\), the length of the string is 0.56 m .
Find the modulus of elasticity of the string.
A horizontal force is applied to \(P\) so that it is held in equilibrium with the string making an angle \(\theta\) with the downward vertical. The length of the string is now 0.72 m .