Question

The distance, d, from the origin on a number line is given by the formula:d = i + st. where i is the coordinate of the starting point, s is the speed, and t is the time.Which of the following equations gives the speed in terms of d, i, and t? A) s = (d - i)/t B) s = (d + i)/t C) s = d - i - t D) s = d/t - i

Answer 1

To get the speed s in therms of the variables d, i and t, que have to clear s from the expression we're given, as following:

`\begin{gathered} d=i+st \\ \rightarrow d-i=st \\ \rightarrow(d-i)/(t)=s \end{gathered}`

This way, the correct expression for s in therms of the variables d, i and t is:

`s=(d-i)/(t)`

(Ans: Option A)