A particle is projected from a point \( \mathrm{A} \) with velocity \( \mathrm{u} \sqrt{2} \) at...
A particle is projected from a point \( \mathrm{A} \) with velocity \( \mathrm{u} \sqrt{2} \) at an angle of \( 45^{\circ} \) with horizontal as shown in figure. It strikes the plane \( \mathrm{BC} \) at right angles. The velocity of the particle at the time of collision is :
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