Roboguru

Dua benda A dan B bermassa masing-masing 600kg dan...

Dua benda A dan B bermassa masing-masing 600kg dan 400kg bergerak berlawanan  arah saling mendekati. Pada suatu saat kedua benda bertumbukan sehingga benda B terpental dalam arah beralwanan dengan arah datangnya dengan kecepatan size 12px 5 size 12px ms to the power of size 12px minus size 12px 1 end exponent. Kecepatan benda A setelah tumbukan adalah ....

  1. 6 comma 6 space m s to the power of negative 1 end exponent

  2. 6 comma 0 space m s to the power of negative 1 end exponent

  3. 4 comma 4 space m s to the power of negative 1 end exponent

  4. 1 comma 4 space m s to the power of negative 1 end exponent

  5. 0 comma 66 space m s to the power of negative 1 end exponent

Jawaban:

straight m subscript straight A equals 600 kg  straight m subscript straight B equals space 400 kg  straight v apostrophe subscript straight A equals space ?  straight v apostrophe subscript straight B equals space 5 bevelled straight m over straight s

Gunakan hukum kekelan momentum

straight m subscript straight A straight v subscript straight A plus straight m subscript straight B straight v subscript straight B equals straight m subscript straight A straight v apostrophe subscript straight A plus straight m subscript straight B straight v apostrophe subscript straight B  left parenthesis 600 right parenthesis left parenthesis 10 right parenthesis plus left parenthesis 400 right parenthesis left parenthesis negative 20 right parenthesis equals left parenthesis 600 right parenthesis left parenthesis straight v apostrophe subscript straight A right parenthesis plus left parenthesis 400 right parenthesis left parenthesis 5 right parenthesis  6000 minus 8000 equals 600 straight v apostrophe subscript straight A plus 2000  minus 4000 equals 600 straight v apostrophe subscript straight A  straight v apostrophe subscript straight A equals negative 4000 over 600 equals negative 6 comma 6 bevelled straight m over straight s

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