A pole-vaulter just clears the bar at 5.53 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3200 J. What is his weight?

578.66 N

Explanation:

The first step is to calculate the mass

mgh= 3200J

3200/9.8×5.53

3200/54.194

m = 59.047 kg

Therefore the weight can be calculated as follows

Weight = m × g

= 59.047 × 9.8

= 578.66 N

car a and b are moving in opposite directions

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32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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