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Nope its not like that.The answer of this problem is "h=v0(the null is index)2(2 is power)/4g but i don't know how to get to the answer.

At school we have a problem to solve but i don't know how to solve this problem. Here is the condition:"Ball is throw vertical upward with inceptive speed v0.Of what height h the kinetic energy of the ball decrease two times? Resistance of the air is ignored." I am sorry if don't write it right...