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Answer:
5.99 J
Explanation:
A ball is thrown 6m above the ground.
Its total energy at that point is 12 J.
The energy of the ball is given by :
E = mgh
Where
m is the mass of the ball
[tex]m=\dfrac{E}{gh}\\\\m=\dfrac{12}{9.8\times 6}\\\\m=0.204\ kg[/tex]
Let E' is the total energy of the ball at a halfway point of motion. h' = 3 m
So,
[tex]E'=mgh'\\\\E'=0.204\times 9.8\times 3\\\\E'=5.99\ J[/tex]
So, the required energy is 5.99 J.