average velocity of both over the 10 s time interval is equal – Discussion Forum

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Ayushree

Asked: August 18, 2026In: Class 9 Science

A graph in Fig. 4.28 shows the change in position with time for two objects A and B moving in a straight line from 0 to 10 seconds. Choose the correct option(s). (i) The average velocity of both over the 10 s time interval is equal since they have the same initial and final positions. (ii) The average speeds of both over the 10 s time interval are equal since both cover equal distance in equal time. (iii) The average speed of A over the 10 s time interval is lower than that of B since it covers a shorter distance than B in 10 seconds. (iv) The average speed of A over the 10 s time interval is greater than that of B since B’s speed is lower than A’s in some segments.

The correct options are (i) and (ii). Both objects have the same initial and final positions, so their average velocities are equal. They also cover the same total distance in 10 seconds, making their average speeds equal.