$\"\"$

\

The acceleration due to gravity is $\"\"$ meters/sec/sec.

\

The initial velocity of object is zero.

\

$\"\"$ .

\

Acceleration of a object is rate of change in velocity $\"\"$ .

\

Velocity is $\"\"$ .

\

$\"\"$ .

\

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

\

$\"\"$ .

\

Substitute $\"\"$ .

\

$\"\"$ .

\

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

\

$\"\"$ .

\

$\"\"$

\

The position of a object at time $\"\"$ is $\"\"$ .

\

Velocity of a object is rate of change in position $\"\"$ .

\

Position at time $\"\"$ is $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

The initial height of object is $\"\"$ feet.

\

$\"\"$ .

\

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

\

$\"\"$

\

Substitute $\"\"$ .

\

$\"\"$ .

\

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

\

$\"\"$ .

\

The object reaches the ground after $\"\"$ sec.

\

$\"\"$ .

\

Substitute $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ m.

\

The stone fall $\"\"$ m.

\

$\"\"$

\

The velocity of an object is $\"\"$ .

\

Substitute $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

Negative velocity means the object is falling down.

\

The impact velocity is $\"\"$ m/sec.

\

$\"\"$

\

The stone fall $\"\"$ m.

\

The impact velocity is $\"\"$ m/sec.