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Fun thought experiment: what would happen if you release a -1kg ball? Both
gravitational mass and inertial mass are negative. Your immediate response
probably isn't correct.)
Since F=mg, and g is downward and m is neg., then the force would be
upward. Then, since a =F/m, F is upward, and m is negative, the
acceleration is downward. So it would behave exactly the same as when
grav. and inertial mass are both positive (but only for this special
case, we can't have friction, for example, adding to an object's
acceleration, can we?).
Am I right? :)
David J. Hamilton, Ed.D. "And gladly wolde he lerne,
Franklin HS, Portland, OR and gladly teche."
email@example.com Geoffrey Chaucer