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## Homework Statement

Bindi pops the cork off a bottle of champagne. The cork travels vertically into the air. She notices that the cork takes 4s to return to starting position.

a) how long does cork take to reach maximum height?

## Homework Equations

I know that a= -9.81m/s/s, and the final velocity would be is 0m/s, but I'm not sure how to work out solution or equation to find solution.

## The Attempt at a Solution

I drew a picture but I still have no clue.