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weight is the upward reaction force of the base we stand on=R
gravitational force is acts downward on the body=mg
an upward acceleration exists=ma
now how to form the equation of motion, 1st forget the acceleration. without it R and mg balance each other out. net force is zero
R=mg ;
mg -R=0
now there is a force present ma, so the equation becomes
mg-R=ma
the force ma is upward, so correct the direction
R-mg=ma
ma=R-mg=800–400=400 N
then a=10 m/s2.
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