notbobpursley

Total Energy at A = Total energy at B 1/2mv^2(A) + mg3.2 = 1/2mv^2(B) + mg4.1 Because at the peak of point B all energy is PE, we can remove 1/2mv^2 (B) from the equation. 1/2mv^2(A) + mg3.2 = mg4.1 because m appears in every term it can be removed. 1/2 v...

The answer from Elena is almost correct. The question asks for the least number of bricks, so you would actually use the smallest side of the brick to stack them. Po = 160 / (.24*.095) =~ 7018 Pa N = 202650 / 7018 = 28.9 = 29 Bricks.