How we know tha
t height is 7
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t=(h^2/2g)^(1÷2)
from it we can get t
t=(h^2/2g)^(1÷2)
keep h as 7
from these t=1.56
from it we can get t
t=(h^2/2g)^(1÷2)
keep h as 7
from these t=1.56
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