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Helpppp Mechanics A Level 9709 w11 42

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Screenshot (107).png
Part (iii)
Screenshot (108).png

For BC: 16 000a = 7 200 - 1 240 - 8 000. <= What formula is this??
16 000 is the mass, 7 200 is driving force of BD, 1 240 is resistance of BC, and what is 8 000? I don't understand anything =o=
 
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Got it... 8000N is the weight of the particle in the inclined slope (mg*sin alpha = 16 000 x 10 x 1/20 = 8 000N)
 
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