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1.A pole-vaulter just clears the bar at 4.36 m and falls back to the ground. The change in the vaulter's potential energy during the fall
1.A pole-vaulter just clears the bar at 4.36 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3400 J. What is his weight
2.Relative to the ground, what is the gravitational potential energy of a 84.2-kg person who is at the top of the Sears Tower, a height of 443 m above the ground
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