Question

A bullet is fired vertically upward from a gun and reaches a height of 7000 ft. Find its initial velocity. How long does it take to reach its maximum height? How long is it in flight?
bobpursley
at the top, vertical velocity is zero
h=vi*t-1/2 g t^2
7000=vi*t-16t^2

this is a quadratic, solve for time.

Initial KE=final PE
1/2 m v^2=mgh solve for v, the initial velocity

how long is the flight? Twice the time to the top.

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