#### Answer

The arrows indicate the direction of motion.

#### Work Step by Step

Since $x=t^2$, $x\geq 0$. So, we have $t=\sqrt{x}$. Substituting $t$ into $y$ gives
$y=(\sqrt{x})^3=x^{3/2}$
Since $x$ is positive, $y$ is increasing. The direction of motion is going up.