A 18 g lead bullet is tested by firing it into a fixed block of wood with a mass...

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...of 1.02 kg. If the block and? A 18 g lead bullet is tested by firing it into a fixed block of wood with a mass of 1.02 kg. If the block and imbedded bullet together absorb all the heat energy generated and, after thermal equilibrium has been reached, the system has a temperature rise measured as 0.020C°, estimate the entering speed of the bullet.
 
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