Question: A solid sphere rolls down an incline plane without slipping. Ifthe center of mass of the sphere has a linear acceleration of 1.21m/s2 , what

A solid sphere rolls down an incline plane without slipping. Ifthe center of mass of the sphere has a linear acceleration of 1.21m/s2 , what is the angle of the incline to the horizontal?

I think the formula is

(m*g)sin(a-f)=a

But im stuck!

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