question_answer

  Study the speed-time graph of a body given here and answer the following questions. (i) What type of motion is represented by OA? (ii) What type of motion is represented by AB? (iii) What type of motion is represented by BC? (iv)Find out the acceleration of the body. (v) Calculate the retardation of the body. (vi) Find out the distance travelled by the body from A to B.

Answer:

                  (i) Consider a body which starts with initial velocity u and due to uniform acceleration a, its final velocity becomes after time t. Then, its average velocity is given by Average velocity (1) The distance covered by the body in time t is given by Distance, s = average velocity X time or or                  (ii) We know that,                .....(i) Also,   Substituting the value of ? in Eq. (i), we have or or or