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Dari gambar berikut, balok A mempunyai massa 2 kg ...

Dari gambar berikut, balok A mempunyai massa 2 kg dan balok B = 1 kg. Bila gaya gesekan antara benda A dengan bidang 2,5 newton, sedangkan gaya gesekan tali dengan katrol diabaikan, maka percepatan kedua benda adalah ....

  1. 20 comma space 0 space straight m. straight s to the power of negative 2 end exponent

  2. 10 comma 0 space straight m. straight s to the power of negative 2 end exponent

  3. 6 comma 7 space straight m. straight s to the power of negative 2 end exponent

  4. 3 comma 3 space straight m. straight s to the power of negative 2 end exponent

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

Jawaban:

straight m subscript straight A equals 2 space kg  straight m subscript straight B equals space 1 space kg  straight f subscript straight A equals 2 comma 5 space straight N

Dengan menggunakan Hukum II Newton :

sum for blank of straight F equals sum for blank of ma  straight a equals fraction numerator begin display style sum for blank of straight F end style over denominator begin display style sum for blank of straight m end style end fraction equals fraction numerator straight W subscript straight B minus straight f subscript straight A over denominator straight m subscript straight A plus straight m subscript straight B end fraction  straight a equals fraction numerator left parenthesis 1 right parenthesis left parenthesis 10 right parenthesis minus 2 comma 5 over denominator 2 plus 1 end fraction  straight a equals fraction numerator 10 minus 2 comma 5 over denominator 3 end fraction  straight a equals fraction numerator 7 comma 5 over denominator 3 end fraction  straight a equals 2 comma 5 space straight m divided by straight s squared

Maka percepatan kedua benda adalah 2 comma 5 space straight m divided by straight s squared

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