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⑵は,1N×1m=1J
100g=1Nなので,2kg=20N
100cmは1mなので,30cm=0.3m
なので,20×0.3=6Jになります
同じく1m=100cmなので,
60cm=0.6m
1N=1m分の1Jなので,
6分の0.6=10N
となります!

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