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The long jump is measured from the front of the jump board to the closes point in the sand that the jumper touches the sand in a straight line.
sandy sand
just that: the sand pit.
a sand pit
Two events in athletics use a sandpit: the long jump, and the triple jump.
because it was more easier
So they land soflty
um...sand,legs,body etc.
so you don't hurt your self
It is about 0.33 m deep.
The answer really requires a cubic measure - the volume - of the construction. 100 square feet can be covered to a depth of only a grain of sand or several inches (or more) of sand and, obviously, the quantity of sand required will vary accordingly.
um...sand,legs,body etc.