Afootball is thrown horizontally off the top of an apartment house that is 78.4 meters high. the ball is thrownat a speed of 15 m/s. how far will the ball travel

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

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hope this !