It might be B I might not be right
f(x)= -x^2+4 plotted vertex (0,4)
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We need to solve the speed formula for d. To do so, let's start by moving the number of the left hand side:

Square both sides to get rid of the square root:

Now plug the known value of the speed to find the distance:

So the closest answer is the last one: d=0.155km