Question: A 4 0 kg box is slides down a ramp. At point A it is moving at a speed of 5 m / / s

A 40kg box is slides down a ramp. At point A it is moving at a speed of 5m//s. It hits a
rough patch of ground at part B (everywhere else is frictionless). The block is still
moving at point C. The coefficient of kinetic friction in point B is 0.25.
a. What is the amount of work done by the rough ground?
I understand we have Ug, Eth and Kinetic energy but I'm confused to find that in correlation with work especially since work is Fdcos
A 4 0 kg box is slides down a ramp. At point A it

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