Answers

2014-08-14T20:50:08+05:30
A pace or a footstep cannot be used as a standard unit of length because the size of pace and footstep vary from person to person. This will lead to confusion while measuring the lengths by different persons. We should use standard units like International System of Units (SI Units). 
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2014-08-14T21:04:39+05:30
Because pace or foot step vary from person to person n is so it cant be used.
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