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    Hi, I'm a Sports Science student and revising for Biomechanics exam at the mo and can't work out this question:

    A sailboarder is zipping northeast across the river with a velocity of 10m/s relative to the water. The river current is moving the water north at a velocity of 3m/s downstream. If the angle between the relative velocity of the sailboard and the river current is 30 degrees, what is the resultant or true velocity of the sailboard?
 
 
 
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