Two smooth prisms of similar right-trian...

Two smooth prisms of similar right-triangular sections are arranged on a smooth horizontal plane as shown in figure. The lower prism has a mass `eta` times the upper prism. The prisms are held in an initial position as shown and are then released. As the upper prism touches the horizontal plane, the distance moved b y the lower prism is

`a-b`

`(a-b)/3`

`(b-a)/2`

`(a-b)/4`

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