My length is correctat 5.07m The method given tofind time in the current solutio

Question

My length is correctat 5.07m
The method given tofind time in the current solution for 10.92 is incorrect. In tryingdifferent approaches, I put in an answer of 5.3sec that got thefollowing response from Mastering Physics.
"Not quite. Checkthrough your calculations; you may have made a rounding error orused the wrong number of significant figures."
I need to know thecorrect approach to solving the problem. I have only one chanceleft to get it right.
**I did sqrt ( ( 2 *length ) ^2 ) / v ) to get the 5.3sec., two sigfigs for5.27

Explanation / Answer

v = 3.7 m/s, = 16o, moment of inertia I =mr2 on the incline, net force = mgsin - f = ma f*r = I* = mr2*a/r so f = ma a = gsin/2 so time for going up = v/a = 2v/gsin the required time = 2*2v/gsin = 5.48 s

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