A) Zero
B) \[10\,\,m{{s}^{-2}}\]
C) \[10\,\pi \,m{{s}^{-2}}\]
D) \[\frac{10}{\pi }\,\,m{{s}^{-2}}\]
Correct Answer: D
Solution :
When the particle completes half revolution, change in velocity \[Av=[5-(-5)]\text{ }m/s=10\text{ }m/s\] Time taken to complete the half revolution is \[t=\frac{\pi r}{v}=\frac{\pi \times 5}{5}=\pi s\] Thus, average acceleration \[=\frac{\Delta v}{t}=\frac{10}{\pi }m/{{s}^{2}}\]
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