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

[填空题]
A ball is thrown straight up with a speed of 30 m/s.t;a01ox ) sg458x r 9o )vwxxdekxkr35zfu2s g (only fill in numericalxtidho.u qq 7 9:4: 2;uhvebobxtn:1 zv;jd :h value in t.u9qhvq 4 ojx di 7v;t;un z:t :eb:hx12:hodbhe 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% 


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