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20 trees
The ball with mass (m) hits the box at a certain velocity (v) and the momentum (mv) is equal to the force (F) at impact times the time (t) it takes to stop resulting in a high acceleration that will deform the box. Mathematically, Ft = mv ; F = mv/t You would need to know the box stiffness property to determine the time
25 million trees are 25 million trees.
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This depends on how many feet the trees are spaced apart. If the trees are spaced about a foot apart, then there is going to be about 43,560 trees in one acre.