A Ferris Wheel Rotating at 20 Rad/s Slows Down $5.0 \mathrm { rad } / \mathrm { s } ^ { 2 }$

Multiple Choice

A Ferris wheel rotating at 20 rad/s slows down with a constant angular acceleration of magnitude $5.0 \mathrm { rad } / \mathrm { s } ^ { 2 }$
How many revolutions does it make while slowing down before coming to rest?

A) 3.2
B) 20
C) 40
D) 6.4