Brainlag PlusRearrange a formula so a different letter is on its own, by undoing the operations in reverse order.
Undo in reverse order
To make t the subject of v = u + at, ask what was done to t: multiplied by a, then u added.
Undo in reverse: subtract u, then divide by a.
- v = u + at
- v − u = at
- t = (v − u)/a
Do the same thing to both sides each time, exactly as when solving an equation.
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 3, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- The Scientific Calculator beside every question
- Anything you get wrong is saved to your flashcards