A Centrifuge in a Medical Laboratory Rotates at an Angular $\pi$

Multiple Choice

A centrifuge in a medical laboratory rotates at an angular speed of 5,400 rpm (revolutions per minute) .When switched off,it rotates 100.0 times before coming to rest.Find the magnitude of the constant angular acceleration of the centrifuge while it slows down to a stop.

A) 65.0 $\pi$ rad/s²
B) 60.0 $\pi$ rad/s²
C) 81.0 $\pi$ rad/s²
D) 76.0 $\pi$ rad/s²
E) 0