a rectangular solid block of dimensions 20 cm by 15 cm by 10 cm has a cylindrical hole bored through its centre.the mass of the block is now 14.9 kg and the material of the block has a density of 5 g cm(-3).what is the cross-sectional area of the hole in cm(2)?
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The coefficient of restitution (COR) is the ratio of the final to initial relative velocity between two objects after they collide. It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision. A perfectly inelastic collision has a coefficient of 0, but a 0 value does not have to be perfectly inelastic. It is measured in the Leeb rebound hardness test, expressed as 1000 times the COR, but it is only a valid COR for the test, not as a universal COR for the material being tested.
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