A rectangular plank of mass m_(1) and height a is on a horizontal surface. On the top of it another rectangular plank of mass m_(2) and height b is placed. The potential energy of the system is

A rectangular plank of mass m_(1) and height a is on a horizontal surf

1.	A rectangular plank of mass m_(1) and height a is on a horizontal surface. On the top of it another rectangular plank of mass m_(2) and height b is placed. The potential energy of the system is
Answer» `(m_(1)+m_(2))((a+b))/2G` `[(m_(1)+m_(2))/2a=m_(2)b/2]G` `[((m_(1))/2+m_(2))a+m_(2)b/2]g` `[((m_(1))/2+m_(2))a+m_(1)b/2]g` Answer :C