A) 80 m
B) 40 m
C) 20 m
D) 4 m
Correct Answer: A
Solution :
From the relation, \[\mu mg=\frac{m{{v}^{2}}}{r}\] \[\Rightarrow \] \[r=\frac{{{v}^{2}}}{\mu g}\] (Given:\[v=72\,km/h=72\times \frac{5}{18}=20\,m/s,\] \[\mu =0.5,g=10\,m/{{s}^{2}}\]) \[=\frac{{{(20)}^{2}}}{0.5\times 10}=\frac{400}{5}=80m\]You need to login to perform this action.
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