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A disc of radius R is rolling purely on ...

A disc of radius `R` is rolling purely on a flat horizontal, with a Constant angular velocity. The angle between the of velocity and acceleration vectors point `P` is given by `sin^(-1) (sqrt2//n)`. What is the value of `n`?

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The correct Answer is:
2

The required angle is `45^@` so `(sqrt(2))/n=1/(sqrt(2))impliesn=2`
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