Velocity-time (v-t) graph for a moving object is shown in the figure. Total displacement of the object during the time interval when there is non-zero acceleration and retardation is
Answer is (B)
Between time interval 20 sec to 40 sec, there is non-zero acceleration and retardation.
Hence distance travelled during this interval = Area between time interval 20 sec to 40 sec
= 1/2×20×3+20×1
= 30 + 20 = 50 m.
