A particle of mass \( 1 \mathrm{~kg} \) has a velocity of \( 2 \mathrm{~m} / \mathrm{sec} \). A ...

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A particle of mass \( 1 \mathrm{~kg} \) has a velocity of \( 2 \mathrm{~m} / \mathrm{sec} \). A constant force of \( 2 \mathrm{~N} \) acts on the particle for \( 1 \mathrm{sec} \) in a direction perpendicular to its initial velocity. Find the angle between velocity vector and displacement vector of the particle at the - end of 1 sec:
(a) \( 45^{\circ} \)
(b) \( 90^{\circ} \)
(c) \( 30^{\circ} \)
(d) None of these
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