A) 5 m
B) 10 m
C) 15 m
D) 20 m
Correct Answer: B
Solution :
\[mg=\frac{\rho Vg}{2}\] \[mg=\rho v'g\Rightarrow v'=\frac{v}{2}\] \[{{\rho }_{0}}v=({{\rho }_{0}}+h\rho g)\frac{v}{2}\] \[h\rho g={{\rho }_{0}}\]
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