Because in an impact the momentum of both object is taken in consideration.
Momentum can be considered mass x speed.
So when you are hitting a ball on a tee the force is solely generated by the force you put behind the swing.
When you are hitting a ball that is speeding towards you, the ball already has some momentum. When you hit it you are going to redirect that momentum, minus some losses in deformation and heat, plus the whole energy you bring with the swing. So in effect, it goes farther
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