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Soal UM-PTKIN Fisika Thn 2010 No. 65 – buku-on-line.com

Soal UM-PTKIN Fisika Thn 2010 No. 65

Soal Fisika UM-PTKIN No. 65

65.   Batu dengan massa 5 kg dilempar vertikal ke atas dengan kecepatan awal 20 m/s. Pada ketinggian 15 m, batu tersebut akan memiliki energi kinetik sebesar ….

(A)   100 J

(B)   250 J

(C)   350 J

(D)  400 J

(E)   450 J

 

JAWABAN DAN PEMABAHASAN

65. jawaban: B

Diket: m=5kg;    vo= 20 m/s;    h= 15 m

Dit: EK…?

Jwb:

Vt2= vo2 – 2gh = 202 – 2.10.15=100 m/s

Ek=1/2. m. v2 = 1/2*5*100= 250 joule

 

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