Posted by todd on Sunday, November 28, 2010 at 7:55pm.
Take the mass of the Earth to be 5.98 ×
1024 kg.
If the Earth’s gravitational force causes a
falling 52 kg student to accelerate downward
at 9.8 m/s2, determine the upward accelera
tion of the Earth during the student’s fall.
Answer in units of m/s2.

physics  bobpursley, Sunday, November 28, 2010 at 7:58pm
The same force acts on each mass
massstudent*g=massEarth*a
solve for a.