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**1. i drop a ball (mass 20 grammes) from a height of 10 meters, after 3 bounces it rises to a height of 2 meters, what is the energy conversion efficiency of each bounce?**

**2. I've been stuck on this for the last hour and have nothing any help would be great.**

**3.the closest i got was doing 10× random percentages 3 times and seeing how close i got**