A $2 \mathrm{~km}$ long pipe of $0.2 \mathrm{~m}$ diameter connects two reservoirs. The difference between water levels in the reservoirs is $8 \mathrm{~m}$. The Darcy-Weisbachfriction factor of the pipe is 0.04 . Accounting for frictional, entry and exit losses, the velocity in the pipe (in $\mathrm{m} / \mathrm{s}$ ) is:

(A) 0.63

(B) 0.35

(C) 2.52

(D) 1.25

A $2 \mathrm{~km}$ long pipe of $0.2 \mathrm{~m}$ diameter connects two reservoirs. The difference between water levels in the reservoirs is $8 \mathrm{~m}$. The Darcy-Weisbachfriction factor of the pipe is 0.04 . Accounting for frictional, entry and exit losses, the velocity in the pipe (in $\mathrm{m} / \mathrm{s}$ ) is:

(A) 0.63

(B) 0.35

(C) 2.52

(D) 1.25

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