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a) $19.0 \textrm{N or }0.704 \textrm{m/s } 57.5^{\circ} \textrm{ below horizontal}$
b)$14.0 \textrm{N or } 0.520 \textrm{m/s } 51.0^{\circ} \textrm{ above horizontal}$

Giancoli 6th Edition, Chapter 4, Problem 24

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Chapter 4, Problem 24 is solved.

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