Question:

While working on a kinematics problem, you come up with a few different equations for an object's final speed.

Possibility $\frac{?}{?}$#$1$: $v_f=\sqrt[\phantom{2}]{2ax}$

Possibility $\frac{?}{?}$#$2$: $v_f=\sqrt[\phantom{2}]{\frac{2a}{x}}$

Possibility $\frac{?}{?}$#$3$: $v_f=\sqrt[\phantom{2}]{2a{x}^2}$

The variables stand for the following quantities.

$v_f$ : final speed

$a$ : acceleration due to gravity

$x$ : position

Which of these equation$($s$)$ can be eliminated on the basis of a units check? Select all that apply.