A bullet of mass \( 0.01 \mathrm{~kg} \) is fired horizontally into...

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A bullet of mass \( 0.01 \mathrm{~kg} \) is fired horizontally into a \( 2 \mathrm{~kg} \) wooden block at rest on a horizontal surface. The coefficient of kinetic friction between the block and the surface is \( 0 \cdot 1 \). The bullet remains embedded in the block and the combination moves \( 20 \mathrm{~m} \) before coming the rest. What is the speed with which the bullet struck the block?
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