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Benda terletak pada bidang datar seperti gambar. Benda dan bergerak turun. Jika massa katrol dan massa tali diabaikan, besar percepatan sistem adalah ....

Benda begin mathsize 12px style straight m subscript 1 equals 5 space kg end styleterletak pada bidang datar seperti gambar. Benda begin mathsize 12px style straight m subscript 2 equals 3 space kg end style dan bergerak turun. Jika massa katrol dan massa tali diabaikan, besar percepatan sistem adalah .... begin mathsize 12px style left parenthesis straight g space equals 10 space ms to the power of negative 2 end exponent right parenthesis end style

  1. 5 comma 50 space straight m. straight s to the power of negative 2 end exponent

  2. 4 comma 50 space straight m. straight s to the power of negative 2 end exponent

  3. 3 comma 75 space straight m. straight s to the power of negative 2 end exponent

  4. 1 comma 50 space straight m. straight s to the power of negative 2 end exponent

  5. 1 comma 25 space straight m. straight s to the power of negative 2 end exponent

Jawaban:

straight m subscript 1 equals 5 space kg  straight m subscript 2 equals 2 space kg

Berdasarkan Hukum II Newton :

ΣF equals Σm. straight a  straight a space equals space fraction numerator begin display style ΣF end style over denominator begin display style Σm end style end fraction equals fraction numerator straight w subscript 2 over denominator straight m subscript 1 plus straight m subscript 2 end fraction  straight a equals fraction numerator left parenthesis 3 right parenthesis left parenthesis 10 right parenthesis over denominator 5 plus 3 end fraction equals 30 over 8  straight a equals space 3 comma 75 space straight m divided by straight s squared

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