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**Maths problem(mechanics--friction)**

A and B are points on the same line of greatest slope of a rough plane inclined at 30◦ to the horizontal.

A is higher up the plane than B and the distance AB is 2.25 m. A particle P, of mass mkg, is released

from rest at A and reaches B 1.5 s later. Find the coefficient of friction between P and the plane.

According to the book the answer is 0.346 and i cannot get the answer:

according to me: friction = mg sin 30

Reaction= mg c0s 30

using F = μ R

i replace but yet cannot get the right answer...please try to work it out i think my method is wrong..?????