A Particle Moves Along a Straight Line with Equation of Motion

Multiple Choice

A particle moves along a straight line with equation of motion $S = t ^ { 3 } = 2 t$ . Find the smallest value of its velocity (for t ≥ 0) .

A) $\frac { 1 } { 2 }$
B) -2
C) $\frac { 1 } { 3 }$
D) $- \frac { 1 } { 2 }$
E) -3
F) 2
G) 3
H) $- \frac { 1 } { 3 }$