system
Given the following post, respond as if you're commenting on Reddit:
human
Is it easier to accelerate at higher speeds?

I've done some googling but seem to be getting mixed answers. I was wondering if it would require less energy to gain speed when you are already travelling at high speeds than it would take to increase speed the same amount but if you were going slowly or not moving at all.

For example would a 5kg rock need more energy to increase speed by 10m/s  if it already travelling at say 50m/s compared to if it was only moving at perhaps 5m/s?
gpt
In a vacuum, all speeds are equivalent (except light speed). So if something is going at 50 m/s and increases its speed by 10 m/s, that is the same as a reference frame where the thing is at rest and starts moving.

In air, drag forces increase with the square of velocity, so going from 50 to 60 m/s is a lot harder than going from 0 to 10.