A) zero
B) \[10m/{{s}^{2}}\]
C) \[10\pi m/{{s}^{2}}\]
D) \[\frac{10}{\pi }m/{{s}^{2}}\]
Correct Answer: B
Solution :
The change in velocity when the particle completes half revolution is given by: \[\Delta V=5m/s-(-5m/s)\] \[=10m/s\] Time taken to complete half revolution \[\Delta t=\frac{\pi r}{V}=\frac{\pi \times 5}{5}=\pi \] \[\therefore \] Average acceleration \[=\frac{\Delta V}{\Delta t}=\frac{10}{\pi }\left( \frac{m/s}{s} \right)\] \[=\frac{10}{\pi }\,m/{{s}^{2}}\]
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