Questions

A rectangular plank of mass 'm₁' and height 'a' is on a horizontal surface. On the top of it another rectangular plank of mass 'm₂' and height 'b' is placed. The potential energy of the system is,

Easy

A

$(m_{1} + m_{2}) \frac{(a + b)}{2} g$

B

$[\frac{m_{1} + m_{2}}{2} a + m_{2} \frac{b}{2}] g$

C

$[(\frac{m_{1}}{2} + m_{2}) a + m_{2} \frac{b}{2}] g$

D

$[(\frac{m_{1}}{2} + m_{2}) a + m_{1} \frac{b}{2}] g$

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