7.D【解析】设A落地前轻绳的拉力大小为FT,A、B的加速度大小均为a1,对A、B分别应用牛顿第二定律可得mg-FT=ma1,Fr-pmg=ma1,解得a12.5m/s2,Fr=1.5N,A错误;A落地瞬间B达到最大速度,根据运动学公式可得B的最大速度为v=√2a1h=2m/s,B错误;A落地后,B做匀减速运动,其加速度大小为a2=g=5m/s2,B继续向右运动的路程为s=0.4m,C错误;根据匀变速直线运动的规律可知B在匀加速和匀减速运动过程的平均速度大小均为元=1m/s,所以整个过程B运动的平均速度大小为lm/s,D正确。

二、读后续写范文(满分25分)Possible version 1Paragraph 1:It was time to put an end to the Magic Marty show. I walked over. "It was fishing line. " I sneeredfolding my arms. Marty subconsciously fingered the fishing line and nervously whispered, "So, are yougoing to tell people? Seeing the panic in his eyes, somehow, I hesitated. Should I_reveal the secret, Martymight lose his new_ friends. Finally, after struggling for a moment, I replied, "Nah, I won't say anythingMarty let out a relieved sigh, and I turned to walk awayParagraph 2Waitr"Marty jumped in front of me. Unexpectedly, he patted my arm, grinning. "You' ve got a prettygood eye for magic. Want to join me? "I nodded joy fully. That's how the Magic Marty and MysteriousMatt Lunch Show began. Now we've been a magic team for three months. And since I became a fellowmagician, Marty has let me in on some of his other tricks. It turns out that instead of a fake magician, Martyis a real friend.(150 words

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