A bird flies for $4s$ with a velocity $v = (t – 2) m/ s$ in a straight line, where $t =$time in second. Calculate the displacement and distance covered by the bird.

 The velocity-time and speed-time graphs of motion of the bird are as follows:

From the graph, displacement s = area A – area B = 0, And distance s = Area A + Area B

$=\frac{1}{2}\times 2\times 2+\frac{1}{2}\times 2\times 2=4 \mathrm{m}\text{. }$