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Physics
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 I drop a 60-g golf ball from 2.0 m high. It rebounds to 1.5 m. How much energy is lost? 

May 21st, 2015

initial potential energy

PE = mgh
PE = 0.06 * 9.8 * 2
PE = 1.176 Joules 

potential energy for the second height

PE = mgh
PE = 0.06 * 9.8 * 1.5
PE = 0.882 Joules 

Loss in energy = initial PE - final PE
Energy loss = 1.176 - 0.882

= 0.294 Joules lost.

May 21st, 2015

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