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## Homework Statement

A missile is launched into the air at an initial velocity of 80 m/s. It is moving with constant velocity until it reaches 1000m, when the engine fails.

a) How long does it take it to reach 1000m

b)How high the missile go?

c)How long does it take for it to fall back to the earth?

d)How long does it stay in the air?

e)How fast is it going when it hits the ground?

## Homework Equations

the 5 kinematic equations: d=v1t + 0.5at^2, d=v2t + 0.5at^2, v2^2=v1^2 + 2ad,

d=(v1+v2)/2 all x t

## The Attempt at a Solution

Ok so i'm confused as to whether the missile instantly starts falling after 1000 m or if it continues for a bit then starts falling. For a) assuming it keeps going up after the engine fails I got t=12.5s but assuming the max height is 1000m I got t=30s

For b) again i'm confused as to whether the max height is 1000m or not and I can't really do the rest without clearing this confusion up