Can people handle the forces of going that fast?

Just going fast does not affect the human body. Astronauts in orbit travel faster than 20,000 MPH. The human body can tolerate 8g of acceleration or more for short periods of time. Top fuel dragsters are capable of about 4g acceleration. Many roller coasters produce 3g of acceleration. Most cars produce almost 1g under maximum braking. If acceleration is limited to 1g, most people will not experience any discomfort. The time to travel estimates assume a maximum of 1g of force, and a top speed of 4,000 MPH

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