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 magnitude of the tangential speed of an object placed 10.0 cm from the center of the wheel is

A) 1.0 m/s.
B) 0.50 m/s.
C) 0.0 m/s.
D) 1.5 m/s.
E) 2.0 m/s.