Question

on hole nine, Richard hit a golf ball. The golf ball weighs 0.20 kg. The acceleration of the ball was 41 m/s2. what was the force of Richard's swing?

Answer 1

Well first of all, nothing "weighs" 0.2 kg. 
The "kilogram" (kg) is a unit of mass, not force.


Force = (mass) x (acceleration)

During the short time the ball was in contact with the clubface,
the force on the ball averaged

               (0.2 kg) x (41 m/s²)  =  8.2 newtons  (about  1.84 pounds)  .

After the ball left the clubface, it stopped accelerating.