Question

A person walks along an east west street and a graph of his displacefment from home is shown In figure. His average velocity for the whole time interval is

Answer 1

First of all, I'm confused about how to find speed from a displacement time graph. It should be rather distance time graph. Even if I find the total distance travelled by the boy from displacement graph and divide it by the total time , my answer doesn't match that given in the book. Here's what I tried : First I found the total distance travelled by the boy , which came out be 120 m , then divided it by 20 seconds. the answer I got was 6 m/s. But in the book , the answer is 2 m/s. I'm confused. even if I find velocity , which is displacement over time , it'll come out to be 0 , as total displacement is 0. Please rectify me if I'm wrong somewhere.

Answer 2

Answer:

As we know that the whole time taken by the person is 19 min

so the displacement is zero because his initial point and final point is same.

so average velocity = Displacement /time

=0/t

=0 Answer