speed doesn’t exist, if you don’t find a relative you are moving from.
if you look at a car, from IT’S perspective, you can be moving backwards 60km/h
if you fly a plane, you are not moving relative to the plane, but are moving relative to earth
speed = distance * time
this above is all averge person should be concerned about, however:
The weird thing is that you can’t exceed speed of light in relative to anyone.
if you were to sit on a rock in space, and send two rockets at 60% speed of light in opposite directions, to eachother they WONT move at the speed of light, even tho for you both of them are moving at the 60% speed of light, with should add up to 120%
what would actually happen, is time would bend in a way that to eachother they will be less than speed of light
this is very confusing topic that you would probably need to take a physics course to understand
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