Answer:
B
Explanation:
<em>A. His speed is 0 m/s
</em>
<em>B. His velocity is 12 m/s
</em>
<em>C. His velocity is 0 m/s
</em>
<em>D. His acceleration is 12 m/s</em>
Total distance traveled by John = 120 + 120 = 240 meters
Total time taken by John to cover the distance = 10 + 10 = 20 s
<em>Average speed of John = total distance traveled/total time taken</em>
= 240/20 = 12 m/s
Hence, the average speed/velocity of John throughout the journey is 12 m/s.
The correct option is B.
A flow of electrical charge from one place to another
is called an electric current. It doesn't need to be steady.
The fact that, in general, liquids and gases expand when heated gives rise to
b) convection currents in fluids due to changing densities.
Because cars and buildings are small in mass and so exert very low gravitational fore which is dominated by the large gravitational force of earth
