1 Q need help

1. The problem statement, all variables and given/known data
a stone is thrown vertically downward from the top of 40 m tall building with an initial speed of 1 after 2s the stone will have traveled a distance of?

2. Relevant equations


3. The attempt at a solution

the answer i was given is 22

and i tried to put 9.8 without negative and it was 21.6 is this one right ??
why is the acceleration positive while going up is negative ???

waiting and thank you


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