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I've solved part a for 0.73 as the static friction coefficient, but cannot get b using the formulas the student guide provided. What am I doing wrong?

It suggests using:

mg(sin(theta)) - f = ma

f = ukmgcos(theta)

a = 2d/t^2

Where uk is the variable for the coefficient of kinetic friction. However how can I apply these formulas if the problem does not provide the mass? I tried making the mass negligible (Setting m to 1) but that doesn't produce the right answer. What am I doing wrong?