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Urgent maths help

I don’t get why they are putting the (horizontal distance) in the vertical expression/ equation
I mean 750m is horizontal distance but they put it with the a=-9.8 which is vertical acceleration how can this be possible…. I’m so confused plz help meIMG_2792.jpegIMG_2793.jpegqiestion 5.4
(edited 1 year ago)
its a vector displacement
i - horizontal direction
j - vertical direction

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