14 The displacement, \(r\) metres, of a particle at time \(t\) seconds is
$$r = 6 t - 2 t ^ { 2 }$$
14
- Find the value of \(r\) when \(t = 4\)
[0pt]
[1 mark]
14 - Determine the range of values of \(t\) for which the displacement is positive.
[0pt]
[2 marks]