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## Homework Statement

A rocket blasts off with constant acceleration straight upward. After 3 seconds the rocket is at a height of 80m. (a) what are the magnitude and direction of the rocket's acceleration? (b) what is its velocity at the time

## Homework Equations

[itex] v=v_0+at [/itex]

[itex] v^2=V_0^2+2a\Delta x [/itex]

[itex] a=v^2-v_0/(2*x) [/itex]

[itex] x=x_0+v_0t+\frac{1}{2}at^2[/itex]

## The Attempt at a Solution

None, because I was unsure how to proceed as using these equations would result in one unknown (either v or a)

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