$s ( t )$ Is the Position of a Body Moving Along a Coordinate

Essay

$s ( t )$ is the position of a body moving along a coordinate line; $s ( t )$ is measured in feet and $t$ in seconds, where $t \geq 0$ . Find the position, velocity, and speed of the body at the indicated time.
$$s ( t ) = \frac { 4 t } { t ^ { 2 } + 1 } ; \quad t = 3$$