Multiple choice

A solid disc of radius r rolls without slipping on a horizontal floor with angular velocity $\omega$ and angular acceleration $\alpha$. The magnitude of the acceleration of the point of contact on the disc is

  1. 0
  2. r$\alpha$
  3. $\sqrt{(r \alpha)^2 + (r \omega^2)^2}$
  4. r$\omega$2
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