A-ball-of-moist-clay-falls-18-3-m-to-the-ground-Physics-Kinematics-Question-help

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A ball of moist clay falls 18.3 m to the ground. It is in contact with the ground for 24.0 ms before stopping. (a) What is the average acceleration of the ball during the time it is in contact with the ground? (Treat the ball as a particle.) (b) Is the average acceleration up or down?