Задача id8863

A projectile is fired from a cannon that does not have a recoil device at an angle α to the horizontal. The speed of the projectile is v, the mass of the projectile is m, the mass of the gun is M. Find the speed of the gun after firing. (Do not take into account the friction between the cannon wheels and the ground; neglect the mass of the powder gases flying out after the projectile.)

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