Question

when A and B are standing on a plank b is at the middle of the plant and a is at the left hand of the plank surface of the plank is smooth system is initially at rest and masses are shown in figure Aand B starts moving such that the position of B remains fixed with respect to ground then alA meets B. Then the point where a and b meets is located at

Answer 1

B meets at end of A line goes

Answer 2

Taking the origin at the centre of the plank. M1X1+M2X2 +M3X3=0(as change in position of centre of mass is 0)

Putting the data in the above equation we get 60(0)+40(60)+40(-x)=0

=>X=60cm

Therefore A and B meet at the right end of the plqnk.