9. An automobile to be transported by ship is raised 7.0 m above the dock. If its gravitational potential energy is 6500 J. what is the automobile's mass.
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photocells convert light energy to electricity

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