A) \[7\,m/{{s}^{2}}\]
B) \[\sqrt{7}\,m/{{s}^{2}}\]
C) \[5\,m/{{s}^{2}}\]
D) \[1\,m/{{s}^{2}}\]
Correct Answer: C
Solution :
Average acceleration\[=\frac{\text{Change}\,\text{in}\,\text{velocity}}{\text{Total}\,\text{time}}\] \[a=\frac{|{{\mathbf{V}}_{f}}-{{\mathbf{v}}_{i}}|}{\Delta t}\] \[=\frac{\sqrt{{{30}^{2}}+{{40}^{2}}}}{10}=\frac{\sqrt{900+1600}}{10}\] \[=5\,\text{m}{{\text{s}}^{-2}}\]
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