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Q. A pail of water is rotated in a vertical circle of radius 1.1m (approximate length of a person's arm). What must be the least speed of the pail at the top of the circle if no water is to spill out?

Q. A 5kg steel ball strikes a wall with a speed of 8m/s at an angle of 60.0° with the surface. It bounces off with the similar speed and angle. If the ball is in contact with the wall for 0.200 s, what is the average force exerted by the wall on the ball? (Suppose right is the positive direction.)

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