An empty box is put on the pan of a physical balance and scale is adjusted to zero by putting \(...

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An empty box is put on the pan of a physical balance and scale is adjusted to zero by putting
\( P \) appropriate weight on the other pan. A stream of

W small identical beads, each of mass \( 4.5 \mathrm{~g} \) are then dropped into the box from height \( 6 \mathrm{~m} \) at a constant rate of 100 beads per second. If the collision between each bead and box is completely inelastic, find the reading of scale (in kg-wt) \( 10 \mathrm{~s} \) after beads begin to fall the box.
(1) \( 1.5 \)
(2) \( 2.5 \)
(3) 5
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