The direction of the gun barrel is rigidly fixed on the railway platform, it makes an angle of 30 degrees with the horizon. The projection on the barrel direction rejected on the ground plane the same angle on the direction of the rails. Determine how far retrace platform when firing a projectile m1 = 60 kg, taking off at a speed v1 = 480 m / s. Platform Weight with instrument m2 = 18 m, the coefficient of friction of 0.03.

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