A Wheel Undergoes Rotational Motion According to the Equation $\phi ( \mathrm { rad } ) = c t + d t ^ { 3 }$

Multiple Choice

A wheel undergoes rotational motion according to the equation $\phi ( \mathrm { rad } ) = c t + d t ^ { 3 }$ , where $\surd$ is in radians, c = 1.0 rad/s, and d = -0.50 rad/s³. At t = 2.0 s the centripetal acceleration of an object 10.0 cm from the center of the wheel is

A) 5.0 m/s².
B) 2.5 m/s².
C) 1.3 m/s².
D) 0 m/s².