[单选题]
10.29: A ball initially at rest ; 8wtmtko kcih)*am7oc h7 57rfalls without air resistance from a+m6qs dyfj84x height h above the ground. If the ball falls the first distance 0.5h in a tim86fxj+ m4 ysdqe t, how much time is required to fall the remaining distance of 0.5h?
