A ball of mass \(10 kg\) moving with a velocity of \(10 \sqrt{3} m / s\) along x-axis, hits anot....

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A ball of mass \(10 kg\) moving with a velocity of \(10 \sqrt{3} m / s\) along x-axis, hits another ball of mass 20 \(kg\) which is at rest. After the collision, first ball comes to rest while the second ball disintegrates into two equal pieces. One piece starts moving along y-axis with a speed of \(10 m / s\). The second piece starts moving at an angle of \(30^{\circ}\) with respect to \(x\)-axis. Speed of second piece (in \(m / sec\) ) is
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