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A bullet moving with a speed of 150ms^-1...

A bullet moving with a speed of `150ms^-1` strikes a tree and penetrates 3.5 cm before stopping. What is the magnitude of its retardation in the tree and the time taken for it to shop after striking the tree?

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`a=3.214xx10^(5) ms^(-2),t=4.67xx10^(4)s`
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