A) 30
B) 40
C) 50
D) 60
Correct Answer: D
Solution :
\[v_{r}^{2}=v_{m}^{2}-{{v}^{2}}\] \[v=\frac{320}{4}m{{\min }^{-1}}=80\,m{{\min }^{-1}}\] \[{{v}_{m}}=\frac{5}{3}{{v}_{r}}\] \[v_{r}^{2}={{\left[ \frac{5}{3}{{v}_{r}} \right]}^{2}}-{{(80)}^{2}}\] \[\Rightarrow \]\[\frac{16}{9}v_{r}^{2}={{(80)}^{2}}\] \[{{v}_{r}}=60\,m{{\min }^{-1}}\]You need to login to perform this action.
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