The force-time \( (F-t) \) graph for linear motion of a body initially at rest is shown in figur...

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The force-time \( (F-t) \) graph for linear motion of a body initially at rest is shown in figure. The segments shown are circular, the linear momentum gained in \( 4 \mathrm{~s} \) is
(a) \( 8 \mathrm{~N}-\mathrm{s} \)
(b) \( 4 \pi \mathrm{N}-\mathrm{s} \)
(c) \( 2 \pi \mathrm{N}-\mathrm{s} \)
(d) \( 8 \pi \mathrm{N}-\mathrm{s} \)
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