12. A rectangular plank of mass 'm1 '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, 1 . m 1 + m 2 a + b 2 g 2 . m 1 + m 2 2 a + m 2 b 2 g 3 . m 1 2 + m 2 a + m 2 b 2 g 4 . m 1 2 + m 2 a + m 1 b 2 g Share with your friends Share 2 Vaibhav Tiwari answered this Dear Student, 5 View Full Answer Ranbeer Ranjan answered this You can find your answer here:https://bit.ly/2Gvs10x Hope that helps. Best of luck! -7
