Two objects of mass \( m \) each moving with speed \( u \mathrm{~m} / \mathrm{s} \) collide at \...

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Two objects of mass \( m \) each moving with speed \( u \mathrm{~m} / \mathrm{s} \) collide at \( 90^{\circ} \), then final momentum is (assume collision is inelastic)
(a) \( m u \)
(b) \( 2 \mathrm{mu} \)
(c) \( \sqrt{2} m u \)
(d) \( 2 \sqrt{2} m u \)
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