Answer:
\[Average\,velocity=\frac{Total\,\,displacement}{Total\,\,time}\]
\[{{V}_{ave}}=\frac{{{x}_{2}}-{{x}_{1}}}{{{t}_{2}}-{{t}_{1}}}=\frac{5-50}{15-12}=\frac{-45}{3}=-15m/s\]
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