The coordinate of a moving particle at a time given by , $x= 5 \sin 10t,y=5 \cos 10t$. The speed of the particle is (in m/s)is:

Question

$\begin{array}{1 1} (a) \;25 \\ (b) \;50\\ (c) \;10 \\ (d) \;none\end{array} $