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Ten days after it was launched toward Mars in December 1998, the Mars Climate Orbiter spacecraft (mass 629 kg) was 2.87 \times 10^{6} \;{\rm km} from the earth and traveling at 1.20 \times 10^{4} \;{\rm km}/{\rm h} relative to the earth.

At this time, what was the spacecraft's kinetic energy relative to the earth?

i tried converting the traveling speed to meters per second, sqauring it, multiplying with the mass times 0.5 and i got it wrong. am i missing something here?

heres the second question What was the potential energy of the earth-spacecraft system?

is it asking me to find the gravitational potential energy or just the potential energy, using m*g*y=U?