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
Taking vertical components equation
(i) gives $ v _{rg}\cos 30{}^\circ =v _{rm}=20\frac{\sqrt{3}}{2}=10\sqrt{3} $
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