The acceleration due to gravity at an altitude y above the surface of the earth can be expressed as a = ?? 32.2 / [1+(y/20.9 x 106)]2 where a and y are expressed in ft/s2 and feet, respectively. Using this expression, compute the height reached by a projectile fired vertically upward from the surface of the earth if its initial velocity is(a) V = 2400 ft/s,(b) V = 4000 ft/s,(c) V = 40,000ft/s.

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1 y