A boat travels due east at a speed 40ms\(^{-1}\)s across a river flow due south at 30ms\(^{-1}\)s. What is the resultant speed of the boat?
R\(^2\) = 40\(^2\) + 30\(^2\)
= 1600 + 900 = 2500
R = \(\sqrt{2500}\) = 50m/s
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