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The mass of the ball is 18 kg. Acceleration due to gravity on the Earth is 10 m/s^2 and on the Moon it is 2 m/s^2. The gravitational potential energy of an object at a height h is equal to PE = m*g*h where m is the mass of the object, g is the acceleration due to gravity.
When the ball is thrown on Earth it rises to 10 m. The energy expended in throwing the ball up is equal to 10*18*10 = 1800 J. If the ball is thrown in a similar fashion, i.e. by expending 1800 J, on the Moon it, rises to a height h where 1800 = 18*2*h or h = 50
The ball rises to a height of 50 m on the Moon.
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