A) \[1\text{ }:\text{ }5\]
B) \[5\text{ }:\text{ }1~~\]
C) \[1\text{ }:\text{ }40\]
D) \[40\text{ }:\text{ }1\]
Correct Answer: D
Solution :
[d] Given \[h=Ax-\text{B}{{\text{x}}^{\text{2}}}\], on comparing with \[y=\text{x}\tan \theta -\frac{g{{x}^{2}}}{2{{u}^{2}}{{\cos }^{2}}\theta }\], we get \[A=\tan \theta =tan45{}^\circ =1,\] and \[\text{B}\,\,\text{=}\frac{g}{2{{u}^{2}}{{\cos }^{2}}\theta }=\frac{10}{2\times {{20}^{2}}\times {{\cos }^{2}}45{}^\circ }=\frac{1}{40}\] \[\therefore \,\,\,\,\frac{\text{A}}{\text{B}}=40.\]You need to login to perform this action.
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