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Thread moved from the technical PF forums so no Homework Help Template is shown

A marble rolls down an inclined plane with an angle of elevation of 5 degrees, roughly 4.9sin(5)m/s/s, and at normal pressure temperature NPT

**considering the marble is a sphere with a radius of 0.85cm and mass of 20g. The whole sphere is assumed to be in contact with the air. I know the air resistance formula however when I create the model it simply is not logical.***what would I need to add to S=1/2 at^2 to include the air resistance***It was 1/2at^2-(air resistance)/mass, what could be wrong with it?**