- #1

a1call

- 90

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**Ignoring drag, terminal velocity and friction**, input 1143 seconds here:

http://keisan.casio.com/exec/system/1224835316

It yields a velocity of 11.2 km/s (Earth's Escape Velocity) at freefall from a height of 6.4 km (a fraction of the height/depth of Everest, Antarctic ice cap and deepest oceanic depth).

Consider a 6.5 km Vaccum filled vertical tube with a half circle at the bottom which a ball could roll at the bottom and redirect upwards after freefall through it.

Such a ball will have a velocity greater than the escape velocity at the bottom of the tube.

This can't be right since considering the tube be a complete U shape then at top/end of the path the speed would be the same as the start of the path namely 0 and no escape would be achieved.

Where did I go wrong?

Thanks in advance.

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