A conducting rod with length $0\mathrm{.}240m,$ mass $0\mathrm{.}140kg,$ and resistance $84\mathrm{.}2$ moves without friction on metal rails as shown in the following figure$($Figure $1).$ A uniform magnetic field with magnitude $1\mathrm{.}50T$ is directed into the plane of the figure. The rod is initially at rest, and then a constant force with magnitude $1\mathrm{.}90N$ and directed to the right is applied to the bar.

How many seconds after the force is applied does the bar reach a speed of $26\mathrm{.}2\frac{m}{s}?$

Express your answer with the appropriate units.

$t=$

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