The distance travelled by a particle is related to time t as $x=4\mathrm{t}^2$. The velocity of the particle at t=5s is :-

Question

$\mathrm{25~ms^{-1}}$

$\mathrm{20~ms^{-1}}$

$\mathrm{8~ms^{-1}}$

$\mathrm{40~ms^{-1}}$

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