Always considered antimater as negative mass so: $$m1=10kg(matter)$$ $$m2=-10kg(antimater)$$ $$displacement=r=10m$$ $$gravity =\frac{Gm1m2}{r^2}=-1N<0!HOW?$$
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$\begingroup$ That is not 0zero factorial. $\endgroup$– protectgoodlivingbeingaskCommented Nov 25, 2020 at 6:42
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1$\begingroup$ What happened to the value of $G$? $\endgroup$– G. SmithCommented Nov 25, 2020 at 6:50
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2$\begingroup$ Antimatter doe not have a negative mass. It has the opposite charge. $\endgroup$– John AlexiouCommented Nov 25, 2020 at 7:05
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$\begingroup$ Here's a recent question on this topic. Although it's closed, it has good info & links. physics.stackexchange.com/q/589812/123208 $\endgroup$– PM 2RingCommented Nov 25, 2020 at 8:15
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1$\begingroup$ Related:physics.stackexchange.com/questions/230786/… $\endgroup$– Lewis MillerCommented Nov 25, 2020 at 15:38
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1 Answer
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- Physicists mostly expect antimatter to have positive gravitational mass because it has positive inertial mass, but until that's empirically verified it's the subject of a small controversy.
- The sign of a force indicates whether it attracts or repels. (If any inertial mass were negative, you'd have to take that into account as well.
- In fact, Newton's formula for the gravity between two positive gravitational masses reflects its being attractive by having a minus sign you didn't know about, in $-Gm_1m_2\vec{r}/r^2=-Gm_1m_2\hat{r}/r^3$.
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$\begingroup$ By assuming antimater mass <0 I felt it would repel mater. $\endgroup$ Commented Nov 25, 2020 at 6:50
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$\begingroup$ @ask Well, now I've explained how signs work, you needn't ever get confused when doing these calculations. $\endgroup$– J.G.Commented Nov 25, 2020 at 7:14