Grade 9 Test on Mechanics 20241217 (id: 0f9c6877b)

[填空题]
A ball is thrown straight up with a speed of 30 m/snsl8/ndfw r6 txj70ktah4z2 : 2xfy,:fn .s /tq7tpeo. (only fill in numerical value int y2:ntofep/7 ,fs.qx the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

参考答案:
空格1: 3.1±5%  空格2: 46±5%  空格3: 11±5% 


本题详细解析: 暂无

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