john learned in his science class that energy is conseved while playing cricket with his friend James if he dropped the ball all the potential energy the ball possess will be converted to kinetic energy just before it hit the ground James disagree with this statement by saying all potential energy will not be converted to kinetic energy .

how can i answer these questions useing the statement above?:
the procedure
variables-manipulated,constant and responding
expected result
a limitation
a precaution

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