A) 5 m/s
B) \[5\sqrt{2}m/s\]
C) 10 m/s
D) 7.5 m/s
Correct Answer: C
Solution :
[c] \[{{x}^{2}}+{{y}^{2}}={{l}^{2}}\] \[2x\frac{dx}{dt}+2y\frac{dy}{dt}=0\] \[\Rightarrow \] \[{{\upsilon }_{b}}=\frac{xdx}{ydt}=10m/s\]\[(x=y\,at\,{{45}^{o}})\]
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