I think you've got it (close enough).
 Quote by indebluez
okye i finally get it:) theres a net force actiing on the ball....this net force on the ball is the force that provides the acceleration upwards...
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Right. During the collision, the net force on the ball is upwards.
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the net force on the ball, is the force of the table on the ball...right?
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"net" force means the (vector) sum of all the forces. On the ball we have two forces: its weight (acting down) plus the large force of the table on the ball (pushing up). The
sum of those two forces gives a
net force upwards.
It's the
net force that determines what happens to the body--how it will accelerate. You can have high forces applied to a body and still have a zero
net force. For example: step on a rubber ball, squashing it against the ground. There are several forces on the ball: your foot exerts a high force, the weight of the ball exerts a force, and the ground pushes up with a large force. But the
net force is zero: they all cancel out.
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theres an equal n opp force on the table exerted by the ball...hence theres a force on the table as well.....
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Right. When the table exerts a force on the ball, the ball exerts an equal force on the table. That's Newton's 3rd law. (Note: this applies to the individual forces between bodies, not the
net force.)