a motorboat is driven across a river at 5km/h at right angles to a current flowing at 3.9km/h. What is the resulting speed of the motorboat?

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  1. When you add the two perpendicular vectors, the resultant vector will be the hypotenuse.

    sqrt[(5^2) + (3.9)^2] = ___

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  2. 6.34km/h

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