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## Homework Statement

Within 4 sec of liftoff, a spacecraft that is uniformly accelerating straight upward from rest reaches an altitude of 450 m [up]. What is the spacecraft's acceleration?

## Homework Equations

The five key equations, plus the velocity, speed, and acceleration equations

## The Attempt at a Solution

I don't know what the altitude would be (Displacement? Distance?), so I can't solve the equation with the five key equations.