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A body with zero initial velocity slips ...

A body with zero initial velocity slips from the top of an inclined plane forming an angle `alpha` with the horizontal. The coefficient of friction `mu` between the body and the plane increases with the distance l from the top according to the law `mu = bl`. The body stops before it reaches the end of the plane. Determine the time t from the beginning of motion of the body to the moment when it comes to rest.

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