question_answer 43)

                  Give example of a motion where \[x>0,\,\upsilon <0,\,a>0\]. At a particular instant.                

Answer:

                  \[x={{x}_{0}}+A{{e}^{-kt}},\] where \[{{x}_{0}}\] and A are constant and \[{{x}_{0}}>A\] and K is positive.                 \ \[u=-AK\,{{e}^{-kt}}\] and \[a=A{{k}^{2}}\,{{e}^{-kt}}\]