A man hits golf ball (2kg) which accelerates at a rate of 20 m/s/s what amount of force acted on the ball

Force = (mass) x (acceleration)

= (2 kg) x (20 m/s²) = 40 newtons.

about 9 pounds.

Note: The ball can only accelerate during the short time

that the clubface is in contact with it. Once it leaves the

clubface, it can't accelerate any more.

Also ... that's one heckuva golf ball. It weighs about 4.4 pounds!