Question

when a ball hits on ground its bound back why it is so​

Answer 1

Answer:

When the ball hits the ground, it is pressed with a force of gravity and other forces that was exerted on it. Due to these forces it's shape is deformed and to retain back its shape, its elastic nature exerts the same amount of force that deformed it. So the ball bounces until it gains back its shape.

Explanation:

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Answer 2

Answer:

Due to force of ground

Explanation:

According to Newton's Third law if motion-

Every action has equal and opposite reaction...

When a ball hits the ground with a force(Action), the ground also applies the same force(reaction) on the ball and hence the ball bounces.

This also explains why the ball bounces higher when thrown with a greater force.