Question

126. A person walks along an east-west street and a graph
of his displacement from home is shown in figure.
His average speed for the whole time interval is
40
20+
15 18 20 21
* (meter)
0-
3 6 9 12
t(sec)
-20
-40​

Answer 1

Explanation:

The average velocity is zero, since the displacement vector is zero. The instantaneous velocities are just the slopes of the curve at each point.

At A the velocity is 40=

6

6.7

m/min east. At B, it is zero. At C it is −

5

65

=−13 m/min east, or +13 m/min