Here ,
let the velocity of flow from the vat is v
height of the vat is h
Now, time taken to fall , t = sqrt(2h/(2 *g))
t = sqrt(h/g)
v = sqrt(2 * g * h/2)
v = sqrt(g*h)
Now, as distance = speed * time
19.7 = sqrt(h/9.8) * sqrt(9.8 * h)
h = 19.7 m
the height of the vat is 19.7 m
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