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A small body was launched up an inclined...

A small body was launched up an inclined plane set at an angle `alpha=15^@` against the horizontal. Find the coefficient of friction, if the time of the ascent of the body is `eta=2.0` times less than the time of its descent.

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The correct Answer is:
`[k=((eta^(2)-1))/((eta^(2)+1))tanalpha]`
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