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**Simple "what is velocity at time t" problem**

## Homework Statement

A helicopter is lifting off. The only forces are air (up) and gravity. What is the vertical speed at time t if it took off at time t=0?

## Homework Equations

g = F(air)/m, g=Δv/Δt

## The Attempt at a Solution

F(air)/m = Δv/Δt

v = tF(air)/m, but I'm told that this is wrong. I believe I need to include g. What am I missing?