(We regard UP as being the POSITIVe direction.)
Now the relation between x and y is:
x2 + y2 = 202
Differentiating throughout with respect to time (since the value of x and y depends on t):
Now, we know
and we need to know the horizontal velocity (`dx/(dt)`) when
`x = 16`.
The only other unknown is y, which we obtain using Pythagoras' Theorem:
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