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As we learnt in
If only conservative forces act on a system, total mechnical energy remains constant -
-
As the ball fall its velocity increases
as it reflect after collistion
So velocity is linear.
Increasing while going down and decreasing while going up.
So correct graph is 3
Option 1)
This is an incorrect option.
Option 2)
This is an incorrect option.
Option 3)
This is the correct option.
Option 4)
This is an incorrect option.