Question

A particle returns to its starting point after one hour. What is its
1. Displacement
2. Average velocity.

Answer 1

1. Displacement

1. We know that displacement is defined as the shortest path travelled by the body between the initial and final position.
2. Thus, as the particle returns to its starting point, its displacement will be equal to zero.
3. Hence, displacement of the particle is zero.
   

2. Average velocity

1. We know that average velocity is defined as the ratio of total displacement made by the body with respect to total time taken.
2. Now in this case the total displacement made by the body is zero.
3. Therefore, $Averagevelocity=\frac{Totaldisplacement}{Totaltimetaken}=\frac{0}{1hour}=0$