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第 1问 :解答下列问题 (问 1～问 5 ) ( 2 4分 )问 1 .如图 1所示 ,在离开地面的高度为ｈ(ｍ)的图 1位置将一个小石子以9.8ｍ/ｓ的速度向水平方向抛出 ,小石子经ｔ(ｓ)后 ,在与地面成 4 5°的角度落下 .则小石子下落过程所经图 2过的时间ｔ以及小石子起初所处的高度ｈ各为多少
1st question: Answer the following questions (Q1 to Q5) (2 4 points) Q1. As shown in Fig. 1, a small stone is 9.8m/s in the position of Fig. 1 with height h(m) off the ground. The velocity of s is thrown horizontally, and after the t(s), the small stone falls at an angle of 45° with the ground. The time t of the falling process of the stone is shown in Figure 2 and the height of the stone at the beginning. h is how much each