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A bullet is fired vertically upwards wit...

A bullet is fired vertically upwards with velocity v from the surface of a spherical planet. When it reache its maximum height, its acceleration due to the planet's gravity is `1//4^(th)` of its value at the surface of the planet. If the escape velocity from the planet is `v_(sec)=vsqrt(N)`, then the value of N is (ignore energy loss due to atmosphere)

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