Newton's law of motion states something along the lines of the action-reaction force. When the volleyball (in motion) comes down, it bounces off the specific area of your hands/arms/wrists used to "bump" the volleyball. This causes the volleyball to fly into the air, while also causing the reaction force of your hands being pushed downward as you feel the force of the volleyball hitting your skin.
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Inertia is essentially an object's resistance to acceleration. When a volleyball player sends the ball flying, its inertia is what keeps it moving with speed. If inertia didn't exist, the ball would fall straight to the ground, and the game would be extremely boring.
Momentum is the mass (weight) multiplied by velocity (speed). If you thow a volleyball slowly it doesn't have much momentum. If you throw it fast it has more momentum. If you fill it with water (heavier) and throw it fast, it has even more momentum.
Well, when you are serving overhand the ball will go straight over your head until the outside force (your hand) will act upon the volleyball making it go over the net.
well if you don't hit the ball on time it will hit the ground and the opponent team will score anyways isn't the part when the ball hits the ground gravity, Newton discovered gravity.