This skateboarding child only needs 8 seconds to make it the 28 meters down the length of a basketball court. What is the average velocity (in m/s) required to make this happen?

the answer is d. 4

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see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west