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## Homework Statement

Grains of sand of mass 2.90x10^-3 g each, fall from a height of 0.5 m on a sticky surface at a rate of 45 grains per second per cm^2. What pressure does this shower of sand exert on the surface, assuming that air resistance can be neglected?

## Homework Equations

p=F/A=mv^2(N/V)

## The Attempt at a Solution

I don't know where to start. Anyone care to point me in the right direction?