Question

Kiran runs along a straight road of length 150 m. After

reaching at end of the road he runs back to his initial
position along the same straight path. If he takes a total
time of 1 minute for completing his running, find the
average speed and average velocity of Kiran.

Answer 1

Step-by-step explanation:

Speed and velocity are not the same thing, as I'm sure you have determined while in physics. To find the average speed, we add the total distance run by Kiran and divide that total number of meters by the number of seconds it took to do this (just because I am going to state the speed and velocity in terms of m/s as opposed to m/min). To find the average velocity, we add the displacements together and divide by the total time. First the average speed:

`s=(150+150)/(60)=(300)/(60)=5(m)/(s)`

Velocity has direction. If Kiran runs to the end of the road (which we will call positive) and then runs back to the start (that direction will be negative), then his displacement fits into the velocity equation as

`v=(150+(-150))/(60)=0` That means, even though he ran a lot and I'm sure he was very tired, his average velocity for the trip was 0 m/s. When velocity is 0, remember that that means that the total displacement was 0.