A) 4scc
B) 6sec
C) \[\sqrt{2} sec\]
D) \[4\sqrt{2} sec\]
Correct Answer: D
Solution :
\[\operatorname{R}=\frac{{{u}^{2}}si{{n}^{2}}\theta }{\operatorname{g}}\] \[78.4={{\left( 39.2 \right)}^{2}}\times \frac{si{{n}^{2}}\theta }{9.8},\,\,\,si{{n}^{2}}\theta =\frac{1}{2}\] \[{{\theta }_{1}}={{15}^{\operatorname{o}}},\,\,\,\,\,\,\,{{\theta }_{2}}={{75}^{\operatorname{o}}}\] \[{{\operatorname{t}}_{2}}=\frac{2\times 39.2}{9.8}sin7{{5}^{o}},\,\,\,\,\,\,{{t}_{1}}\frac{2\times 39.2\times sin1{{5}^{o}}}{9.8}\] \[{{\operatorname{t}}_{2}}-{{t}_{1}}=8\left( sin75-sin15 \right)\] \[{{\operatorname{t}}_{2}}-{{t}_{1}}=4\sqrt{2}sec\]
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