If you just drop a standard lead bullet, it falls in like 1 second. If you shoot it from a gun, why does it take so long to fall down? Doesn't gravity pull on it the same speed?
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3$\begingroup$ Does this answer your question? How does gravity affect bullets? $\endgroup$– anna vCommented Feb 1, 2020 at 4:31
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1$\begingroup$ This is explored here physics.stackexchange.com/questions/10773/… , and the answer is given vacuum the time taken is the same. (Note that if the bullet could reach escape velocity it would never hit the ground !) $\endgroup$– anna vCommented Feb 1, 2020 at 4:32
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$\begingroup$ This is just an illusion. It takes the same time for the bullet to fall as compared to a ball dropped from the same height. $\endgroup$– user249968Commented Feb 1, 2020 at 4:35
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Assuming you shoot it horizontally and the ground is flat, it doesn't: it takes the same amount of time to hit the ground as a bullet that's dropped from your hand.
This is easily seen from elementary kinematics, $x = ut + 1/2 at^2$. $u$ is zero for both cases, and $a = g$, so the time taken is the same.
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1$\begingroup$ It is unusual to use a coordinate system in which the positive $x$-axis is “down”, especially when you have mentioned shooting the bullet horizontally. Normally the horizontal would be $x$ and the negative $y$ or $z$ axis would point down. $\endgroup$– G. SmithCommented Feb 1, 2020 at 5:21
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$\begingroup$ It's just the formula that I internalized - some people use $s$ to represent the displacement, for example, and would write that equation with $s$ instead of $x$. $\endgroup$– AllureCommented Feb 1, 2020 at 5:54