\textbf{167-} A body of mass $20\,\text{kg}$ moves with constant velocity $\vec{v} = \left(5\dfrac{\text{m}}{\text{s}}\right)\hat{i}$ in a straight path. The net force is $\vec{F}_{\text{net}} = (4\text{N})\hat{i}$. For how many seconds does this force act on the body so that the impulse of the two becomes equal?
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(1) $20$ \qquad (2) $25$ \qquad (3) $40$ \qquad (4) $50$
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