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Space debris is left from old satelittes and their launchers is becoming a hazard to others...

Space debris is left from old satelittes and their launchers is becoming a hazard to others satellites.

a)calculate the sppeed in m/s of a satellite in an orbit 630 km above the earths surface

   7548.03 m/s- i got correct then i need help with

b) suppose a loose rivet is in an orbit of the same radius that intersects the satellites orbit at an angle of 90 degrees relative to Earth. What is the velocity in m/s of the rivet relative to thes atellite just before striking it in m/s (enter the magnitude)...

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