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Which would not reduce the amount of green house gasses in the air

The amount of potential energy possessed by an elevated object is equal to

The basketball coach tells his team to run sprints back and forth across the court, which is 30 m long. they start at the left end of the court, run back and forth 6 times, then end back at the left end of the court where they began. what distance did they run? what is their displacement?