Problem 1.45

A shell acquires the initial velocity $v=320 \mathrm{~m} / \mathrm{s}$, having made $n=2.0$ turns inside the barrel whose length is equal to $l$ $=2.0 \mathrm{~m} .$ Assuming that the shell moves inside the barrel with a uniform acceleration, find the angular velocity of its axial rotation at the moment when the shell escapes the barrel.