A) 6
B) 5
C) 7.5
D) 10
Correct Answer: B
Solution :
\[m=\frac{{{v}_{o}}}{{{u}_{o}}}\left( 1+\frac{D}{{{f}_{e}}} \right)={{m}_{o}}\left( 1+\frac{D}{{{f}_{e}}} \right)\] Þ \[30={{m}_{o}}\left( 1+\frac{25}{5} \right)={{m}_{0}}\times 6\] Þ \[{{m}_{o}}=5\].
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