Bola 350 g dilepas dari ketinggian 1,25 m. Jika te...

Bola 350 g dilepas dari ketinggian 1,25 m. Jika terjadi tumbukan elastis sebagian (e = 0,8), kecepatan pantul bola setelah memantul sebanyak dua kali adalah ... $undefined$

5 m/s $undefined$
4 m/s $undefined$
2 m/s $undefined$
2,5 m/s $undefined$
0,8 m/s $undefined$

Jawaban:

Kecepatan bola sebelum pantulan pertama;

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 0 end cell equals cell square root of 2 g h end root end cell row blank equals cell square root of 2 open parentheses 10 close parentheses open parentheses 1 comma 25 close parentheses end root end cell row blank equals cell 5 space straight m divided by straight s end cell end table end style$

setelah memantul kedua kali;
$table attributes columnalign right center left columnspacing 0px end attributes row blank blank e end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell v subscript 1 over v subscript 0 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell v subscript 2 over v subscript 1 end cell end table$

$table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell v subscript 1 over v subscript 0 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell v subscript 2 over v subscript 1 end cell end table$

$table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell v subscript 1 squared over v subscript 0 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table v subscript 2$

$v subscript 2 table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 8 end table squared cross times table attributes columnalign right center left columnspacing 0px end attributes row blank blank 5 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 3 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight m end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank divided by end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight s end table$

Maka kecepatan bola setelah memantul kedua kali adalah 3,2 m/s

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