a man hits a golf ball (0.2kg) which accelerates at a rate of 20 m/s what amount of force acted on the ball

The ball only accelerates during the brief time that the club is in contact with it. After it leaves the club face, it takes off at a constant speed.If it accelerates at 20 m/s² during the hit, then   Force = (mass) x (acceleration) = (0.2kg) x (20 m/s²) = 4 newtons .

Force = mass * acceleration F = 0.2 * 20 = 4 Newtons