A) \[10/\sqrt{2}\,km/h\]
B) 5 km/h
C) \[10\sqrt{3}\,km/h\]
D) \[5/\sqrt{3}\,km/h\]
Correct Answer: C
Solution :
Taking vertical components equation (i) gives \[{{v}_{rg}}\cos 30{}^\circ ={{v}_{rm}}=20\frac{\sqrt{3}}{2}=10\sqrt{3}\,km/hr\]
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