An athlete with a mass of 60 kg jumps from a height of 6 m to the surface of the water in a swimming pool. if g is 10 m/s2, determine: a. Potential energy when jumping …? b. Kinetic energy at the center of the board and the water (v = 5m/s) …..? c. Its Mechanical Energy ( EM = EP + EK ) …..?

Penyelesaian :

Di ketahui :

g = 10m/s

m = 60 kg

h = 6m

v = 5 m/s

Di tanya :

a. energi potensial saat melompat ?

b. energi kinetik di pusat dan air ?

c. energi mekanik ?

Jawab :

a.energi potensial saat melompat

Ep = m.g.h

= 60kg.10m/s.6m

= 3600Joule

b.energi kinetik di pusat dan air

Ek = ½.m.v²

= ½.60kg.5m/s²

= ½.60kg.25m/s

= 30kg.25m/s

= 750joule

c. Enegi mekanik

EM = EP + EK

= 3.600joule + 750joule

= 4350joule

Detail jawaban :

Mapel : fisika

kelas : 7

Materi : bab 6 – energi sistem dalam kehidupan

kode soal : 6

kode kategorisasi :7.6.6

kata kunci : energi potensial ,energi kinetik ,energi mekanik

Jawaban: i have found the answer and i maked it in a paper

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