Question:
Mark $(\sqrt{)})$ against the correct answer in the following:
If $x=a t^{2}, y=2 a t$ then $\frac{d y}{d x}=?$
A. $\frac{1}{t}$
B. $\frac{-1}{t^{2}}$
C. $\frac{-2}{t}$
D. none of these
Solution:
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