• # question_answer A body travels uniformly a distance of $(13.8\,\pm \,0.2)m$in a time$(4.0\,\pm \,0.3)s.$The velocity of the body within error limits is A) $(3.45\pm 0.2)m{{s}^{-1}}$          B) $(3.45\pm 0.3)m{{s}^{-1}}$C) $(3.45\pm 0.4)m{{s}^{-1}}$          D) $(3.45\pm 0.5)m{{s}^{-1}}$

Here,$S=(13.8\pm 0.2)m$and $t=4.0\pm 0.3)$sec Expressing it in percentage error, we have. $S=13.8\pm \frac{0.2}{13.8}\times 100%=13.8\pm 1.4%$and $t=4.0\pm \frac{0.3}{4}\times 100%=4\pm 7.5%$ Hence, the correction option is [b].