Find the maximum shear stress and the deflection induced in a helical spring of the following specifications, if it has to absorb 10,000kgf-cm of energy:
Mean diameter of spring = 10cm
Diameter of Steel wire, used for making the spring = 2cm
Number of coils = 30
Modulus of rigidity of steel
= 8.5 $\times$105kgf/cm2