A policeman kicks in a door with a force of 4500 N. What force does the door apply to the policeman’s leg?

-4500 N

Source:

The police officer must be angry 0_0

good for her? ? where is the question?

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be