Physics Unit2: Kinematics One Dimensional Motion (id: de4fdd795)

本题目来源于试卷: Physics Unit2: Kinematics One Dimensional Motion，类别为 通用国际物理

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[填空题]
A stone is dropped fromwy:r+l1v 6 nv* yekv3d the roofva qwo1kj+ 44g of a building; 2.20 s after that, a second stone is thrown straight down with an initiav4jkao w+q4g1l speed of $25 \; m/s$ and the two stones land at the same time.
(a) How long did it take the first stone to reach the ground?    $s$
(b) How high is the building?    $m$
(c) What is the speed of the first stone just before it hit the ground?    $m/s$
(d) What is the speed of the second stone just before it hit the ground?    $m/s$

参考答案:
空格1: 9.09  空格2: 405.25  空格3: 89.12  空格4: 92.56 


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