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1. A child located at point A equidistant from a semicircular wall and the center 0 of the wall, throws a ball forming an angle

1. A child located at point A equidistant from a semicircular wall and the center 0 of the wall, throws a ball forming an angle of 45 with OA. Knowing that after hitting the wall the ball bounces parallel to OA, find the coefficient of restitution between the wall and the ball. Ans. e = 0.84 RR/2 A 45

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