The problem in physics (section 1) №029

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From an instrument that has no recoil device, the shooting was carried out in a horizontal direction. When the gun was still secured, the projectile flew at a speed of v1 = 600 m / s, and when the gun was given the freedom to roll back, a shell flew at a speed of v2 = 580 m / s. How fast rollback in this instrument?

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