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A box is put on the platform of a spring balance which is adjusted to zero when the box is empty . A stream of pebbles is then poured into the box from height h above its bottom at a constant rate of n pebbles per second . Find the scale reading t seconds after the pebbles begin to fill the box , assuming that the collisions between the pebbles and the box are completely inelastic .

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The correct Answer is:
mngt + mn`sqrt(2gh)`
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NN GHOSH-LAWS OF MOTION, FREE BODY DIAGRAM-Exercise (A)
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