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|dw:1363676611270:dw|

i worked out acceleration is 1.53ms^-2 left
and
Force is 76.6N

|dw:1363679086031:dw|

w=50(9.81)=490.5N
\[\sum F_y=0 \\ \\ n+Fsin(40)-w=0 \\ \\ n=490.5-100\sin(40) \\ \\ n=426N\]

thank you :)