Four acrobats of mass 68.0 kg, 68.0 kg, 62.0 kg, and 55.0 kg form a human tower, with each acrobat standing on the shoulders of another acrobat. The 68.0-kg acrobat is at the bottom of the tower. (a) What is the normal force acting on the 68.0-kg acrobat? (Enter the magnitude only.) N (b) If the area of each of the 68.0-kg acrobat's shoes is 480 cm2, what average pressure (not including atmospheric pressure) does the column of acrobats exert on the floor? Pa (c) Will the pressure be the same if a different acrobat is on the bottom?

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A: Solution-

Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!