If a sphere is rolling, the ratio of the translational energy

If a sphere is rolling, the ratio of the translational energy to total kinetic energy is given by

E = E_t + E_r =	1	mv² +	1	Iω²
	2		2

=	1	mv² +	1	×		2	mr²		ω²
	2		2			5

=	1	mv² +	1	mv² =	7	mv²
	2		5		10

=	5
	7