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Q.
A body moves due east with velocity $20km/hr$ and then due south with velocity $30 km/hr$. The resultant velocity is (in Km/hr)
Motion in a Plane
Solution:
$R _{ v } =\sqrt{ V _{ E }^{2}+ V _{ s }^{2}+2 V _{ E } V _{ s } \cos 90^{\circ}}$
$=\sqrt{(20)^{2}+(30)^{2}} $
$=\sqrt{400+900}$
$=\sqrt{1300}$
$=36.05 km / hr$
