The velocity-time graph depicts a cyclist's movement. Determine the cyclist's displacement in 15 seconds.

The velocity–time graph shown is a straight line which indicates a uniform motion with a constant velocity, of 20 m/s. 

Displacement can be calculated as the area under the graph. 

$\therefore$The displacement covered in 15 sec is calculated as:

$\mathrm{Displacement} = \mathrm{v} \times \mathrm{t}$

                             $= 20 \times 15 = 300 m$