11- A ball of mass 1 kg collided vertically with the Earth's surface at a speed of 20 m/s. If the ball rebounds a) the amount of movement of the ball before hitting the ground. Calculate: b) the change in the amount of motion of the ball. c) The thrust caused by the ball during its contact with the ground. d) If the contact time with the ground is 0.02sec, what is the average force exerted on the ball? , at a speed of Sm/s,

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