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Imagine a hard surface along x-z plane t...

Imagine a hard surface along x-z plane to be fixed.A] particle moving along the line 4x+3y-12=0, with a speed of u=10m/s, from the positive side of y -axis,approaches towards the plane and collides.If the coefficient of restitution be "e=0.75" ,then the speed of the particle after collision will be "n sqrt(2)m/s" ."]

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