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Sebuah bola sedang meluncur menuruni lintasan licin. Bila laju benda di titik A sama dengan begin mathsize 12px style 6 space straight m. straight s to the power of negative 1 end exponent space dan space straight g space equals space 10 space straight m. straight s to the power of negative 2 end exponent end style, laju benda di tiitik B adalah ....

  1. square root of 52 space straight m. straight s to the power of negative 1 end exponent

  2. square root of 65 space straight m. straight s to the power of negative 1 end exponent

  3. square root of 92 space straight m. straight s to the power of negative 1 end exponent

  4. square root of 95 space straight m. straight s to the power of negative 1 end exponent

  5. square root of 128 space straight m. straight s to the power of negative 1 end exponent

R. Maiza

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

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Pembahasan

straight h subscript straight A equals 5 comma 6 straight m  straight h subscript straight B equals 1 straight m  straight v subscript straight A equals 6 space straight m divided by straight s  straight g equals 10 space straight m divided by straight s squared  straight v subscript straight B ?    Gunakan space hukum space kekekalan space energi space mekanik space colon  EM subscript straight A equals EM subscript straight B  EP subscript straight A plus EK subscript straight A equals EP subscript straight B plus EK subscript straight B  down diagonal strike straight m. straight g. straight h subscript straight A plus 1 half down diagonal strike straight m. straight v subscript straight A superscript 2 equals down diagonal strike straight m. straight g. straight h subscript straight B plus 1 half down diagonal strike straight m. straight v subscript straight B superscript 2  straight g. straight h subscript straight A plus 1 half straight v subscript straight A superscript 2 minus straight g. straight h subscript straight B equals 1 half straight v subscript straight B superscript 2  1 half straight v subscript straight B superscript 2 equals left parenthesis 10 right parenthesis left parenthesis 5 comma 6 right parenthesis plus 1 half left parenthesis 6 right parenthesis squared minus left parenthesis 10 right parenthesis left parenthesis 1 right parenthesis  straight v subscript straight B superscript 2 equals left parenthesis 56 plus 18 minus 10 right parenthesis cross times 2  straight v subscript straight B equals square root of 128 space straight m divided by straight s

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