Answer
The answers to (a) and (b) remain the same.
Work Step by Step
In part (a), the speed at the bottom of the ramp is $~~v = \sqrt{(2)(gL~sin~\theta-L~g\mu_k~cos~\theta)}$
In part (b), the distance the crate slides across the floor is $~~d = \frac{v^2}{2g~\mu_k}$
Since neither value depends on the mass, the answers to (a) and (b) remain the same.
