Answer
$$v_i=v_f-at$$
Work Step by Step
To solve the given equation for $v_i$, we keep the term $ v_i$ and move out all other terms to the other side as follows:
$$
v_f=v_i+at \Longrightarrow v_i=v_f-at
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 6 - Section 6.7 - Formulas - Exercises - Page 256: 34
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