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A ball is dropped straight down towards the floor from a height of 1.5 m. It...

A ball is dropped straight down towards the floor from a height of 1.5 m. It bounced back up to a height of 1.2 m. How fast would you have to throw it at the floor for it to return to a height of 1.5 m?  

Hint: figure out how much energy it loses during the bounce.

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