Answer:
4
Explanation:
It has 8 O atoms and 4 O2(g) molecules
speed is the magnitude of velocity which is given as 90 km/hr and it does not change. only the direction change , the direction at any time is given by the tangent to the circle at that time and location.
from the diagram , at north side, the velocity is directed in west direction
so, question number 10 answer is 82 watts