Question: I have initial v and t; it is a projectile motion of a person jumping up on a force plate and the initial height is

I have initial v and t; it is a projectile motion of a person jumping up on a force plate and the initial height is 1.2m, initial v is 2.31 and t is 0.219s I need to know the max height and I'm confused with the acceleration if it will be positive or negative in the equation. can you explain it to me plz?

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