#co-efficient of friction
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Because you should have used
v = u - at equation
Because there is retarding motion here
a will come out as 2/3 and then you'll get the coeff of friction as 2/3g
a = -2/3 is fine (in fact, more correct based on the graphic next to the diagram, in my opinion)
it's just that F is negative the absolute value of friction
Ya it is correct because negative of acceleration is retarding motion