usaha yang paling besar dilakukan oleh benda nomor

Daftar Isi

Pembahasan

Diketahui

bold Benda bold space bold 1 m subscript 1 equals 8 space kg v subscript 1 equals 2 space straight m divided by straight s v subscript 1 apostrophe equals 4 space straight m divided by straight s bold Benda bold space bold 2 m subscript 2 equals 8 space kg v subscript italic 2 equals 3 space straight m divided by straight s v subscript 2 apostrophe equals 5 space straight m divided by straight s bold Benda bold space bold 3 m subscript 3 equals 10 space kg v subscript 3 equals 5 space straight m divided by straight s v subscript 3 apostrophe equals 6 space straight m divided by straight s bold Benda bold space bold 4 m subscript 4 equals 10 space kg v subscript 4 equals 0 space straight m divided by straight s v subscript 4 apostrophe equals 4 space straight m divided by straight s bold Benda bold space bold 5 m subscript 5 equals 20 space kg v subscript 5 equals 3 space straight m divided by straight s v subscript 5 apostrophe equals 3 space straight m divided by straight s

Ditanya: Usaha terbesar (W)?

Penyelesaian:

Apabila sebuah benda mengalami perubahan kelajuan maka besar usaha yg dikerjakan sebesar pergantian energi kinetik yg terjadi pada benda tersebut.

W equals increment E K W equals 1 half m v apostrophe squared minus 1 half m v squared W equals 1 half m open parentheses v apostrophe squared minus v squared close parentheses

Maka Usaha pada setiap benda yakni:

Benda 1 

W equals 1 half cross times 8 open parentheses 4 squared minus 2 squared close parentheses W equals 48 space straight J

Benda 2

W equals 1 half cross times 8 open parentheses 5 squared minus 3 squared close parentheses W equals 64 space straight J

Benda 3

W equals 1 half cross times 10 open parentheses 6 squared minus 5 squared close parentheses W equals 55 space straight J

Benda 4 

W equals 1 half cross times 10 open parentheses 4 squared minus 0 squared close parentheses W equals 80 space straight J

Benda 5

W equals 1 half cross times 20 open parentheses 3 squared minus 3 squared close parentheses W equals 0 space straight J

Diantara perjuangan yg dilaksanakan benda tersebut, yg terbesar yaitu perjuangan oleh benda nomor 4 yakni senilai 80 J.

Kaprikornus, jawaban yg tepat ialah D.

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