Solve the Problem $\frac { 1 } { 5 }$ Radian Has Been Covered, What Is the Angular Speed of String

Multiple Choice

Solve the problem.
-A ball on the end of a string is spinning around a circle with a radius of 5 centimeters. If in 13 seconds a central angle of $\frac { 1 } { 5 }$ radian has been covered, what is the angular speed of the ball?

A) $\frac { 13 } { 5 }$ radians per sec
B) $\frac { 5 } { 13 }$ radians per sec
C) 65 radians per sec
D) $\frac { 1 } { 65 }$ radian per sec