15 centimeters
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Six pennies (copper coated steel) equal 0,972 cm.
6 cm tall
7.5 cm
The average stack of 5 pennies is 7 mm tall.
A US penny (US $0.01 coin) is 1.55 mm thick, so multiplying that by 15, a stack of 15 pennies is 23.25 mm or 2.325 cm tall