Question

A position-time graph is shown for a motorcycle driving south.


According to the graph, what is the motorcycle’s average velocity?

A) 5 km/h south
B) 24 km/h south
C) 120 km/h south
D) 150 km/h south

Answer 1

the answer is B 24 km/h south

Answer 2

Answer:

B) 24 km/h south

Explanation:

The average velocity of the motorcycle is given by:

$v=\frac{\Delta p}{\Delta t}$

where

$\Delta p$ is the displacement (variation in position)

$\Delta t$ is the time interval

From the graph, we observe that:

$\Delta p = 150 km - 30 km = 120 km$

$\Delta t = 5 h - 0 h=5 h$

So, the average velocity is

$v=\frac{120 km}{5 h}=24 km/h$

And the direction is south, since the motorcycle is moving south.