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52) b. 1 dan 4
53) c. 50 joule
54) c. kinetik menjadi potensial
52. b
53.
m= 10 : 1000 = 0,01 kg
Ek = 1/2. m. v.v
= 1/2. 0,01.5.5
=0,125 j
54. b energi potensial berubah mnjd energi kinetik