Foundation June 2017 Paper 2 Q21
21. Luca has to use the formula
\[v = u + at.\](a) Find the value of \(v\) when \(u = 53\), \(a = -4\), and \(t = 6\). [2]
(b) Find the value of \(u\) when \(v = 20\), \(a = 2\) and \(t = 6\). [2]
(c) Rearrange the formula to make \(t\) the subject. [2]
| Scheme | Marks | Comments |
|---|---|---|
| \(v = 53 + (-4) \times 6\) | M1 | Accept embedded answers throughout Q21 |
| \(v = 29\) | A1 |
| Scheme | Marks | Comments |
|---|---|---|
| \(20 = u + 2 \times 6\) | M1 | |
| \(u = 8\) | A1 |
| Scheme | Marks | Comments |
|---|---|---|
| \(v - u = at\) | M1 | |
| \(t = (v - u)/a\) | A1 | If no marks, award SC1 for an answer of \(t = (v + u)/a\) |
| (6) |