5 A particle starts from a point \(O\) and moves in a straight line. The velocity of the particle at time \(t \mathrm {~s}\) after leaving \(O\) is \(v \mathrm {~m} \mathrm {~s} ^ { - 1 }\), where
$$\begin{array} { l l }
v = 1.5 + 0.4 t & \text { for } 0 \leqslant t \leqslant 5 ,
v = \frac { 100 } { t ^ { 2 } } - 0.1 t & \text { for } t \geqslant 5 .
\end{array}$$
- Find the acceleration of the particle during the first 5 seconds of motion.
- Find the value of \(t\) when the particle is instantaneously at rest.
- Find the total distance travelled by the particle in the first 10 seconds of motion.