Question

A box is put on a scale that is marked in units of mass and adjusted to read zero when the box is empty. A stream of marbles is then poured into the box from a height h = 6.93 m above its bottom at a rate of R = 128 (marbles per second). Each marble has mass m = 7.14 g. If the collisions between the marbles and the box are completely inelastic, find the scale reading at time t = 5.90 s after the marbles begin to fill the box.