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Please Solve! I know the final answer is supposed to be 10.5lb, but don't know how my prof got th...

Please Solve! I know the final answer is supposed to be 10.5lb, but don't know how my prof got that! Need the steps.  

engineering   Mechanical-Engineering   
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os oppos to to motion. te canta cloceytse 0-2 Fに cosoA62 L 50 A62 Los

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