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Ignoring air resistance,

Take acceleration due to gravity as 10 (m/s)/s

potential energy is m*g*h ( mass * acceleration due to gravity * height to travel )

say the brick is to fall 10 metres, then m*g*h = 2*10*10 = 200 joules,

you have to give the ping pong ball a potential fall of 2000 metres to equal the brick.

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