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A crate of fruit with a mass of 31.0kg and a specific heat capacity of 3800 J/kg K slides down a ramp inclined at an angle of 38.4 below the horizontal. The ramp has a length of 9.00 m.

I got the first part of the question which was:

If the crate was at rest at the top of the incline and has a speed of 2.20 m/s at the bottom, how much work W_f was done on the crate by friction?

and then the next part is:

f an amount of heat equal to the magnitude of the work done by friction goes into the crate of fruit and the fruit reaches a uniform final temperature, what is its temperature change DeltaT?

so i went ahead and did it using Q=mcdeltaT with Q = W_f and m= 31 and c= 3800 to work out delta T or should m = mgsin38.4? I can't seem to figure what mass I need to use!

Thanks in advance