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Lihat tabel berikut! Tabel di atas menunjukkan ...

Lihat tabel berikut!

Tabel di atas menunjukkan tiga buah benda bergerak lurus berubah beraturan menempuh jarak yang sama. Besar kecepatan akhir P dan kecepatan awal Q pada gerak benda tersebut adalah....undefined

  1. begin mathsize 14px style 20 space ms to the power of negative 1 end exponent space dan space 20 space ms to the power of negative 1 end exponent end style undefined

  2. begin mathsize 14px style 20 space ms to the power of negative 1 end exponent space dan space 28 space ms to the power of negative 1 end exponent end style 

  3. begin mathsize 14px style 20 space ms to the power of negative 1 end exponent space dan space 40 space ms to the power of negative 1 end exponent end styleundefined

  4. begin mathsize 14px style 40 space ms to the power of negative 1 end exponent space dan space 20 space ms to the power of negative 1 end exponent end styleundefined

  5. begin mathsize 14px style 40 space ms to the power of negative 1 end exponent space dan space 40 space ms to the power of negative 1 end exponent end styleundefined

Jawaban:

Diketahui :

Ketiga bena menempuh jarak yang sama.

Ditanya :

P dan Q ?

Jawab :

Mencari s dari data benda ke tiga :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript t squared end cell equals cell v subscript o squared plus 2 a s end cell row cell open parentheses 30 close parentheses squared end cell equals cell open parentheses 0 close parentheses squared plus open parentheses 2 close parentheses open parentheses 3 close parentheses s end cell row 900 equals cell 0 plus 6 s end cell row cell 6 s end cell equals 900 row s equals cell 150 space straight m end cell end table end style 

Mencari P dari data benda pertana :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript t squared end cell equals cell v subscript o squared plus 2 a s end cell row cell open parentheses P close parentheses squared end cell equals cell open parentheses 20 close parentheses squared plus open parentheses 2 close parentheses open parentheses 4 close parentheses open parentheses 150 close parentheses end cell row cell P squared end cell equals cell 400 plus 1200 end cell row cell P squared end cell equals 1600 row P equals cell 40 space straight m divided by straight s end cell end table end style 

Mencara Q dari data benda ke dua :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript t squared end cell equals cell v subscript o squared plus 2 a s end cell row cell open parentheses 50 close parentheses squared end cell equals cell open parentheses Q close parentheses squared plus open parentheses 2 close parentheses open parentheses 3 close parentheses open parentheses 150 close parentheses end cell row 2500 equals cell Q squared plus 900 end cell row cell Q squared end cell equals 1600 row Q equals cell 40 space straight m divided by straight s end cell end table end style 

Jadi, jawaban yang benar adalah E.

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