When the oil from a circular cylinder leaked, the formula for the speed of the leak is V = kh^2, where h was the height of the remaining oil and k was constant. If the height of the cylinder is 4, the speed of the leak is Vâ€™, When the height of the oil remaining is 12, what was the speed of the leak, in terms of Vâ€™? Choose the correct choice from the following choices.
A) 9 v â € ™
B) 4 v â € ™
C) v â € ™ / 2
D) v â € ™ / 4
E) v â € ™

Rationale: when h = 4 v = v ' so v ' = k . 16 hence k = v ' / 16 now when h = 12 v = ( v ' / 16 ) . 12 ^ 2 v = v ' . 144 / 16 v = 9 v ' ans : a
Answer: A