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Q.

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

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a

(m1+m2)(a+b)2g

b

[m1+m22.a+m2b2]g

c

[(m12+m2)a+m2b2]g

d

[(m12+m2)a+m1b2]g

answer is C.

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Detailed Solution

Question Image

w=m1ga2+m2g(a+b2)

=m1ga2+m2ga+m2gb2

=[(m12+m2)a+M2b2]g

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