A child in a tree throws a ball downward to a friend on the ground 2.0 m below her. The friend catches the ball after 0,5 s. How fast did the child in the tree throw the ball?

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A child in a tree throws a ball downward to a friend on the ground 2.0 m below her. The friend catches the ball after 0,5 s. How fast did the child in the tree throw the ball?

 
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