[填空题]
A person jumps off a diving board 4.0 m above the water’sm2d3yg k+2brd(usmltk7e). y surface into a dee,tnr8q.os)fh 5f 29v5 evbboip pool. The person’s downward motion stops 2.0 m below the surface of the water. Estimate the average deceleration of the person while under the w 5v.r)f ehi95bsv q2oob,t8nfater. $\approx$ $m/s^2$ (Round to the nearest integer)
