The formulae for torque is simple the product of the applied force and the perpendicular distance.
The greater the perpendicular force, the greater the torque assuming a constant value of force.
Applying the force at the doorknob gives for a greater distance between the force and the turning point compared to applying the force at the midpoint of the door ( which is at a shorter distance)
From the free fall movement we have the following formulas: and , First we need to find the height to time iqual to 3.04 s using the formula: and remember that golf ball was released from the rest (Vo= 0 (m/s)) so , we get: h = -45.28 (m) with the height that we have got, now the velocity of the ball is calculate using solving for Vf, we get: replacing the values given , so we get: Vf = 29.79 (m/s).