$\"\"$

\

The first ball is thrown upward then the acceleration of the object is $\"\"$ m/s².

\

$\"\"$ ft/s².

\

The acceleration of the object is $\"\"$ , where $\"\"$ is the velocity.

\

Hence $\"\"$ .

\

The antiderivative of $\"\"$ is $\"\"$ .

\

Velocity of the ball is $\"\"$ ft/s.

\

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

\

$\"\"$

\

Therefore the velocity of the first ball at time $\"\"$ is $\"\"$ .

\

$\"\"$

\

The velocity of the object is $\"\"$ , where $\"\"$ is the distance.

\

Hence $\"\"$ .

\

The antiderivative of $\"\"$ is

\

$\"\"$

\

Displacement is $\"\"$ .

\

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

\

$\"\"$

\

Therefore the displacement of the first ball at time $\"\"$ is $\"\"$ .

\

$\"\"$

\

The second ball is thrown upward after $\"\"$ s then the acceleration of the object is $\"\"$ m/s².

\

$\"\"$ ft/s².

\

The acceleration of the object is $\"\"$ , where $\"\"$ is the velocity.

\

Hence $\"\"$ .

\

The antiderivative of $\"\"$ is $\"\"$ .

\

Velocity of the ball is $\"\"$ ft/s.

\

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

\

$\"\"$

\

Therefore the velocity of the second ball after $\"\"$ s is $\"\"$ .

\

$\"\"$

\

The velocity of the object is $\"\"$ , where $\"\"$ is the distance.

\

Hence $\"\"$ .

\

The antiderivative of $\"\"$ is

\

$\"\"$

\

Displacement is $\"\"$ .

\

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

\

$\"\"$

\

Therefore the displacement of the second ball after $\"\"$ s is $\"\"$ .

\

$\"\"$

\

The balls are passes each other when $\"\"$ .

\

$\"\"$

\

After $\"\"$ s the balls passes each other.

\

$\"\"$

\

After $\"\"$ s the balls passes each other.