Total speed is $V=\sqrt{100^2+(-10)^2+20^2}=\sqrt{10500}$ m/s. Sideslip satisfies $\sin\beta=v/V$, with lateral velocity v = −10 m/s. Therefore $\beta=\sin^{-1}(-10/\sqrt{10500})=-5.6004^\circ$, approximately −5.60°. The negative sign follows the lateral component.
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