Figure shows the position-time graph of a body of mass 0.04 kg.  Suggest a suitable physical context for this motion. What is the magnitude of each impulse ?

From the graph, it is clear that the direction of motion is changing after every 2 seconds. And has the same magnitude after 2 seconds.

$\overline{j}=(m\overline{v_1}-m\overline{v_2})$ = 0.04 (1-(-1))³ x ${10}^{-2}$=$\text{8}\times {\text{10}}^{-\text{4}}{\text{kg m s}}^{-\text{1}}$

This can be understood from a situation that a ball collides with wall elastically in seconds and returns to the original mean position after 4 seconds.