$\"\"$

The position function is $\"\"$ .

The velocity of the wrench $\"\"$ .

At the object falls downs the ground is equal to the object impact the ground.

Therefore the potential energy is equal to the kinetic energy.

$\"\"$ .

Mass cancels out.

$\"\"$

$\"\"$ , where $\"\"$ is the height of the object and $\"\"$ g is acceleration due to gravity for freely falling body.

$\"\"$ meters and $\"\"$ meters per second^2.

Negative sign indicates the object for freely falling body.

$\"\"$

The velocity of the object impact the ground is $\"\"$ m/sec.