A small ball thrown with an initial velocity u directed at an angle above the horizontal collides inelastically (e = 1/4) with a vertical massive wall moving with a uniform horizontal velocity u/5 towards ball. After collision with the wall, the ball returns to the point from where it was thrown. Neglect friction between ball and wall. The time t from beginning of motion of the ball till the moment of its impact with the wall is (tan37 = 3/4)
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velocity of the ball rolling speed
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