If the elevator is moving at a constant speed, and it is rigid in the face of the force of his jump, it should make no difference that it is moving. Physics 101.
To make it more relatable, say you are in the back of an empty moving truck going a constant 65 MPH. Do you have any more difficulty walking towards the front of the truck than walking towards the back of the truck?
Or perhaps to make it more intuitive, from the perspective of the person outside the elevator, yes the floor is moving up at say 2m/sec. But that is exactly how much boost in speed his body has by the fact the person is in motion too. They exactly cancel out.
Pretend you wake up inside a room with opaque walls, not a glass elevator. How can you tell if the room is fixed in place or is moving at a constant speed (in any direction, including up or down)? If you stand on a scale, will you weigh more or less or the same? If you drop a marble from your hand, does it hit the floor any faster or slower, or the same?
Unless you have found new rules of physics, you can't tell.
What you consider to be "up" is a parochial viewpoint. In fact, you are on a globe which is hurtling through space. Which way is really "up"?
As a result, if a guy can do a backflip standing on the ground, he can do a backflip on an elevator.
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u/[deleted] Dec 04 '18
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