Why is it as Humans that we have not yet come up with a way to measure speed?

I don't think anyone could ever read that post and accuse you of overthinking

If you travel 100km in one hour, then your average speed is 100km/h. Of course, there may be parts of the journey where you're travelling slower than that, and parts that you're travelling quicker.

But if you're using a device to measure your speed in real time (speedometer, GPS, etc), it will tell you your current (instantaneous) speed (to within a certain tolerance of accuracy) over the course of the journey. It will show you starting off at 0 and ramping up to 100km/h, then maybe slowing down to 80km/h taking a bend and speeding up to 120km/h coming out of the bend and onto a straight. It's dynamically measuring your speed as you travel.

As pah said, speed is the relationship between distance and time, but that doesn't mean that you have to have travelled 100km in an hour to calculate that you're travelling at 100km/h. You could hop in your car and hit the accelerator and 15 seconds later your speedo would show that you're travelling at 100km/h, even though you've only travelled a few hundred metres. It doesn't mean that you need to gave travelled 100km for it to calculate that.

When you're measuring speed, you're not measuring force at all. The force required to move the object to or at a particular speed would depend on the mass of the object, friction, wind resistance, etc. There would be more force required to move a truck to a speed of 100km/h than to move a bicycle to 100km/h (in the same conditions).

This is exactly what speed is. Speed is the rate at which an object covers distance, so you can't measure it without referring to rate (time) and distance. I think you're getting hung up on the difference between average speed (total distance covered divided by the time interval) and instantaneous speed (observed snapshot of measured speed at a distance approaching zero) . But both can be easily measured.

Nah, he'd have figured it out by now with a few wraps of daycent gear 😉

It’s all relative, generally speaking.

I have a court case for speeding coming up soon. Will you represent me?

Of course the real question is...

"What is the airspeed velocity of an unladen swallow?"

100 Kph is Mach .0081. Sorted

African or European?

That’s average speed.

Theres no way of measuring speed at a given point in time, as at any given point in time, nothing is moving at any speed.

We can therefore only measure average speed.

Your overthinking and need to use simple maths instead

Calculus 101:

which is how the kinematic equations are derived:

For vehicles its even easier in practical application, vehicle sensors measure this (usually on the assumption of no-slip condition of tyres etc), for aircraft they use pitot tubes and other derived fundamental physical maths to calculate speed from differences in air pressure at points on the instrument:

OP might thrive in an engineering program.