The black dots at the top of F ? ig. Q2.2 represent a series of high-speed photographs of an insect flying in a straight line from left to right (in the positive x -direction). Which of the graphs in Fig. Q2.2 most plausibly depicts this insect’s motion?
Solution 2DQ In the graph a), the insect’s motion is shown as there are two black dots representing two positions of the insect. The velocity is constant here. In graph b), the acceleration is decreasing but there is only one black dot, which does not show the motion of the insect. In graph c), the graph shows that the position of the insect is changing continuously but in a descending order, which contradicts the statement given in the question. The insect actually is moving in the +ve x-axis with high speed but according to the graph it is not the case. In graph d), the velocity of the insect is increasing but there is one black dot, which shows it’s position. So, this is not the actual motion of the insect. In graph e), the velocity of the insect is decreasing but there is again one black dot showing it’s position. CONCLUSION: So, graph a) is true.