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Firecracker

 Published on Saturday, 1st January 2011, 04:00 pm; Solved by 2832;
Difficulty rating: 35%

Problem 317

A firecracker explodes at a height of $\pu{100 m}$ above level ground. It breaks into a large number of very small fragments, which move in every direction; all of them have the same initial velocity of $\pu{20 m/s}$.

We assume that the fragments move without air resistance, in a uniform gravitational field with $g=\pu{9.81 m/s^2}$.

Find the volume (in $\pu{m^3}$) of the region through which the fragments move before reaching the ground. Give your answer rounded to four decimal places.