Equation of the particle motion is $\"\"$ .

Where $\"\"$ is measured in meters and $\"\"$ is measured in seconds.

Find the velocity at $\"\"$ sec.

The velocity $\"\"$ is defined as $\"\"$ . $\"\"$

$\"\"$ m/sec.

Substitute the value of $\"\"$ sec in velocity function.

$\"\"$

$\"\"$ m/sec.

Find the speed at $\"\"$ sec.

Speed of the particle is the absolute value of the velocity.

Speed of the particle at $\"\"$ is $\"\"$ m/sec.

Velocity of the particle at time $\"\"$ sec is $\"\"$ m/sec.

Speed of the particle at $\"\"$ is $\"\"$ m/sec.