Prove the result that the velocity `v` of translation of a rolling body (like a ring, disc, cylinder or sphere) at the bottom of an inclied plane of a hight h is given by `v^(2) = (2gh)/((1 + k^(2)//R^(2))` using dynamical consideration (i.e. by consideration of forces and torque). Note k i sthe radius of gyration of the body about its symmentry axis, and `R` is the radius of the body. The body starts from rest at the top of the plane.