# A projectile is fired straight upward from the Earth’s surfaceat the South Pole with an initial speed equal to one third theescape speed. (a) Ignoring air resistance, determine how farfrom the center of the Earth the projectile travels before stoppingmomentarily. (b) What is the altitude of the projectile atthis instant?

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A projectile is fired straight upward from the Earth’s surface
at the South Pole with an initial speed equal to one third the
escape speed. (a) Ignoring air resistance, determine how far
from the center of the Earth the projectile travels before stopping
momentarily. (b) What is the altitude of the projectile at
this instant?

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Step 1

(a)The initial speed of the projectile is given by,

Step 2

Thus,

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