A particle starts from rest. Its acceleration $a$ versus time $t$ is shown in the figure. The maximum speed of the particle will be:

Question

$80 \, \text{m s}^{-1}$

$40 \, \text{m s}^{-1}$

$18 \, \text{m s}^{-1}$

$2 \, \text{m s}^{-1}$

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