Two Pegs $A$ and $B$ were fixed on opposite banks of a $50 \mathrm{~m}$ wide river. The level was set up at $A$ and the staff readings on Pegs $A$ and $B$ were observed as $1.350 \mathrm{~m}$ and $1.550 \mathrm{~m}$, respectively. Thereafter the instrument was shifted and set up at B. The staff readings on Pegs $\mathrm{B}$ and $\mathrm{A}$ were observed as $0.750 \mathrm{~m}$ and $0.550 \mathrm{~m}$, respectively. If the R.L. of Peg $\mathrm{A}$ is $100.200 \mathrm{~m}$, the R.L. (in $\mathrm{m}$ ) of $\operatorname{Peg} B$ is

Two Pegs $A$ and $B$ were fixed on opposite banks of a $50 \mathrm{~m}$ wide river. The level was set up at $A$ and the staff readings on Pegs $A$ and $B$ were observed as $1.350 \mathrm{~m}$ and $1.550 \mathrm{~m}$, respectively. Thereafter the instrument was shifted and set up at B. The staff readings on Pegs $\mathrm{B}$ and $\mathrm{A}$ were observed as $0.750 \mathrm{~m}$ and $0.550 \mathrm{~m}$, respectively. If the R.L. of Peg $\mathrm{A}$ is $100.200 \mathrm{~m}$, the R.L. (in $\mathrm{m}$ ) of $\operatorname{Peg} B$ is

Data for an airplane are given as follows: weight $W=30 k N$, thrust available at sea-level $T_{0}=4000 N$, wing planform area $S=30 m^{2}$, maximum lift coefficient $C_{L \max }=1.4,$ and drag coefficient $C_{D}=0.015+0.024 C_{L}^{2} .$ Assume air density at sea-level $\rho_{\infty}=1.22 \mathrm{~kg} / \mathrm{m}^{3} .$

Stall speed of the airplane in $\mathrm{m} / \mathrm{s}$ is

(A) 17.36

(B) 34.22

(C) 45.52

(D) 119.46

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