It’s the same in the EU but as with cars, the power can be electronically limited, so the user can remove the limitation with some limited tinkering. So you end up with and electric motorbike, and there is no regular check or registration. I have also never Heard of any form of control about this. Still better than letting people buy cars that can go 250kmh and trusting them with it, but at least you can track car owners.
Actually it does make a difference, as cynetic energy is proportionnal to mass, so 30kmh car is much more dangerous than a 30kmh bike. Though it does not invalidate your point
Not that I don’t agree with you, but to be fair, cars do require a license, they have to be registered and reguraly checked, which is not the case for a bike. In my opinion the failure here is that those should not be allowed for sale as bikes. Those are motocycle in all but name.
Sorry I don’t have much time today to get into it. Seems to me you can’t solve for case 2 here since in this case m2 and m1 are switched. But it does not matter, I am not trying to solve for speed before and after.
The force of the impact does not depend on the mass, I agree, but the energy to dissipate (in the cyclist body) is much higher. I’m just saying that inertia plays a role as it contribute to the energy necessary to stop either vehicule. I am happy to be proven wrong, I just don’t think this is the right equation to do so.