Change of subject question. Make 'a' the subject of the formula v = u + at.

Rule: An equation must be balanced. Therefore, in order to keep the equation balances, what you do to one side you must do to the other side. Change of subject questions require you to isolate the required letter on one side of the equation. In change of subject question such as the one above 'v = u + at', first you need to realise that the equation is the same as +v= +u + ((+a)x(+t)). To begin with to remove the 'u' from the right hand side of the equation we should subtract the 'u' and thus given our rule of balanced equations we should do the other side as well. (v - u = u - u + at ) and this is equal to (v-u=at). Then to remove the 't' from the right hand side of the equation we should divide the 't'. We divide because to get rid of a 'x t' we need to divide 't' and thus given our rule of balanced equations we should do that to the other side as well. (v - u)/t = (at)/t  >>>>>>>>>> t/t =1 ((v - u)/t = 1a (v - u)/t = a