Physics

Problem

A board is

2.50\,\text{m}\,\pm\,0.02\,\text{m}

long. A strip of wood

35.6\,\text{cm}\,\pm\,0.1\,\text{cm}

is added to its length. The total length in metres, written with its absolute uncertainty, is a)

2.856\,\text{m}\,\pm\,0.021\,\text{m}

2.86\,\text{m}\,\pm\,0.02\,\text{m}

2.86\,\text{m}\,\pm\,0.03\,\text{m}

2.856\,\text{m}\,\pm\,0.031\,\text{m}