[单选题]
96.17: A ball which is dropped fromqf+ up)x44k t2jyka.jg y;bin+, 8 -mnr1outa the top of a building strikes the groun.vm m0utvlrq7 +,z9a *n xq.mdd with a speed of 30 m/s. Assume air resistance can be ig lnz x7+. m.v*dmruq0qvm,t9anored. The height of the building is approximately: