Calculating Rotational Kinetic Energy with Unknown Radius and Mass

[hippolyta2078795]

A bowling ball ( I = 2/5 M ^R2 ) encounters a 0.8 m vertical rise on the way back to the ball rack. If the ball rolls without slipping with a center of mass translational velocity of 4.0 m/s at the bottom of the rise.

How do I find the rotational kinetic energy of the ball at the top or bottom without knowing the radius? I know how to find the translational speed at the top.

 

[hippolyta2078795]

I just figured it out. Just need to substitute properly.

 

[hippolyta2078795]

I was mistaken. I do not know the mass.