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## Homework Statement

If Inga, the Laboratory Assistant, rolls a spare head down a 4 m ramp because it was spherical and solid and too heavy at 4.5 kg at a speed of 4.5 m/s, what was its total kinetic energy?

## Homework Equations

KE = (1/2) I ω^2

I = (2/5) MR^2

## The Attempt at a Solution

Basically, I'm not sure how to solve this without the sphere's radius. Any help, solutions, or hints would be highly appreciated.