question_answer

The velocity-time plot for a particle moving on a straight line is shown in figure. (a) The particle has a constant acceleration (b) The particle has never turned around. (c) The particle has zero displacement. (d) The average speed in the interval 0 to 10s is the same as the average speed in the interval 10s to 20s. Which of the above statements are correct? (a) only c is correct          (b) only b is correct (c) both a & d are correct (d) none of these

Answer:

Since velocity-time graph is a straight line, the slope of this straight line is constant and hence the particle has a constant acceleration and the areas OAB and BCD are same, so the average speed in the interval 0 to 10 s and 10 s to 20 s are same.