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A tanker filled with water starts at res...

A tanker filled with water starts at rest and then rolls, without any energy loss to friction, down a valley. Initial height of the tanker is `h_1`. The tanker, after coming down, climbs on the other side of the valley up to a height `h_2`. Throughout the journey, water leaks from the bottom of the tanker. How does `h_2` compare with `h_1`?

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The correct Answer is:
`h_(2)=h_(1)`
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