Here we have a typical moments question. The start of the diving board is the pivot (draw a picture)To answer this question we need to know that sum of the clockwise moments must equal the sum of the anticlockwise moments (principle of moments) and we will need to know the equation: moment = force x perpendicular distance from the pivot, and the equationclockwise moments: moment from the man = (60 x 9.81*) * 2 anticlockwise moments: moment from the spring = upward force from spring * 0.3therefore: (60 x 9.81) * 2 = F * 0.3F = 3900N*9.81 is the gravitational field strength