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The speed of a particle moving in a circle of radius \( r=2 \mathrm{~m} \) varies with time \( t \) as \( v=t^{2} \) where, \( t \) is in
\( \mathrm{P} \) second and \( v \) in \( \mathrm{m} \mathrm{s}^{-1} \). The net acceleration at \( t=2 \)
\( \mathrm{W} \) is
(1) \( \sqrt{40} \mathrm{~ms}^{-2} \)
(2) \( \sqrt{60} \mathrm{~ms}^{-2} \)
(3) \( \sqrt{80} \mathrm{~ms}^{-2} \)
(4) \( 10 \mathrm{~m} \mathrm{~s}^{-2} \)
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