[单选题]
10.29: A ball initially at rest falls withouqzouea,l.k : cp;-kg9t air resistance frafo ke,vmc;+i3 3+bhqom a height h above the ground. If the ball falls the first distance 0.5h in a time t, how much time is required to fall the remaining div+fkoibq,h; e3ma3+c stance of 0.5h?
