A ball of mass m = 70 g hits the vertical wall normally to it and bounces off it in the opposite direction at a lower speed. During the collision with the wall, the momentum of the ball changed to Δp = 2,1Ns. Over a period of time τ = 1.5 s after impact against the wall, the ball fell to the ground at a distance L = 2 m from it. Find the speed with which the ball flew to the wall.

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