The total kinetic energy will be equivalent to the potential energy; The total kinetic energy is given by the sum of transitional kinetic energy and the rotational kinetic energy. Rotational kinetic energy I= 1/2mR², but rotational energy =1/2 I w² Thus rotational energy is equal to 1/4 mR²w², which is equivalent to = 1/4 mv² since v= wR Thus; Total kinetic energy = 1/2 mv² + 1/4 mv² hence; Mgh = 3/4 mv² gh = 3/4 v² ( assuming g = 9.81 m/s²) 72.1035 = 3/4 v² v = 9.805 = 9.805 m/s
