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The \( x \) and \( y \) coordinates of the particle at any time are \( x=5 t-2 t^{2} \) and \( y=10 t \) respectively, where \( x \) and \( y \) are in metres and \( t \) in seconds. The acceleration of the particle at \( t=2 \mathrm{~s} \) is
\( P \)
(a) \( 5 \mathrm{~m} \mathrm{~s}^{-2} \)
(b) \( -4 \mathrm{~m} \mathrm{~s}^{-2} \)
W)
(c) \( -8 \mathrm{~m} \mathrm{~s}^{-2} \)
(d) 0
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