$A$ wheel of radius $0.20 \ m$ starts from rest and rotates with an angular acceleration of $1 \ rad/s^2$. What will be the centripetal acceleration of a point on its circumference when it has rotated through an angle of $90^o$?
- A$\pi \ m/s^2$
- B$0.5 \ \pi \ m/s^2$
- C$2.0 \ \pi \ m/s^2$
- D$0.2 \ \pi \ m/s^2$
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