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m . g = k . q . q /r²
r²= k . q . q /(m . g)
r= √ (k . q . q/(m . g))
k=9 .10^9
q=1,6 . 10^-19
m= 9 . 10^-31
g= 9,8
tinggal msukkin nilainy, kemudian htung.