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1.PE = 120 J, h = 3m, g = 9.8 M = 4.08
2 PE = 6 x 9.8 x 20 PE = 1176 Joules
3.PE= 2268J / 9.8 / 3.6 = 63kg
4.PE= 145J / 5.8m / 9.8g = 2.5m
5.PE= 500J / 5kg / 9.8 = 10.2 m
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