how do i calculate the kinetic energy of a planet at perihelion velocity if mass is given at 5.7x x 10^24 and v = 30.29 km s-1?

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explanation:

and 1and 1

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