Answer:
clockwise and counter clockwise
it depends wich way you start paddling
In the above problem, we need to find mass of the second child, so that the Center of Mass remains at the origin( pivot).
CM= m1r1+m2r2/m1+m2
0= 20*-2+16*r2/20+16
r2= 40/16
r2= +2.5 m
C. The cell wall supports the plant cell as it contains celluose which is a very strong substance and even thought chloroplast is in both that is the only available answer. Hope it helps