[单选题]
10.29: A ball initially at rest falls without air ryqk 15ll 4gkz2 u:x0sjesiste q+ 65xfpy db8dpavuc**1q:f ance from 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 distance ofq x6f5dpv8q1 d*:a b*cy +eufp 0.5h?