A Rolling Wheel of Diameter of 68 Cm Slows Down $0.90 \mathrm { rad } / \mathrm { s } ^ { 2 }$

Multiple Choice

A rolling wheel of diameter of 68 cm slows down uniformly from 8.4 m/s to rest over a distance of 115 m. What is the magnitude of its angular acceleration if there was no slipping?

A) $0.90 \mathrm { rad } / \mathrm { s } ^ { 2 }$
B) $5.7 \mathrm { rad } / \mathrm { s } ^ { 2 }$
C) $11 \mathrm { rad } / \mathrm { s } ^ { 2 }$
D) $1.8 \mathrm { rad } / \mathrm { s } ^ { 2 }$