If you can jump around 128cm high on earth (measured at your center of mass), you can accelerate yourself to more than 5m/s upwards. Most healthy adults should

If you can jump around 128cm high on earth (measured at your center of mass), you can accelerate yourself to more than 5m/s upwards. Most healthy adults should be able to do that, especially with a running start. It's about as much as you need to do to get a passing grade in PE at age 16 in most places. Also in this hypothetical you don't have to fight much gravity while accelerating - only inertia.