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A bullet of mass 2.0×10−3 kgkg embeds itself in a wooden block with mass 0.981 kgkg...

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Physics

A bullet of mass 2.0×10−3 kgkg embeds itself in awooden block with mass 0.981 kgkg , which then compresses a spring(kkk = 130 N/mN/m ) by a distance 5.5×10−2 mm beforecoming to rest. The coefficient of kinetic friction between theblock and table is 0.60.

a. What is the initial speed of the bullet?

b. What fraction of the bullet's initial kinetic energy isdissipated (in damage to the wooden block, rising temperature,etc.) in the collision between the bullet and the block?

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