1. The diagram below shows the velocity-time graph for a particle having initial velocity $um{s}^{-1}$ and velocity $vm{s}^{-1}$ at time t seconds.

(i) Explain how the graph shows that the acceleration of the particle is constant.

(ii) Use the graph to show that the displacement of the particle, from its position at $t=0$, is given by

$s=\frac{1}{2}t(u+v)$