[单选题]
10.29: A ball initially at rest falls without air resist+ azsa9l doy 8sm/co10a njz1(ance from a hekl359: 0mtmcp - sdqppight h above the ground. If the ball falls the first distance 0.5h in a time t, how much time imqpd3l:kts c p590m-ps required to fall the remaining distance of 0.5h?
