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①1秒50回打点なので
1÷50=1/50(秒)
②BCは5打点分なので
(1/50)×5=5/50=1/0=0.1(秒)
③0.1秒間で18.8cm 進んでるので、
18.8(cm)÷0.1(s)=188(cm/s)
です。

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