sodium element have a valency equal to what
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Hydrogen ,lithium etc has equal valency with sodium elements
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A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with an uniform speed of 7m/s. It hits the floor of the elevator (length of the elevator = 3 m) and does not rebound. What is the heat produced by the impact ? Would your answer be different if the elevator were stationary ?
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