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v= 5 m/s
Ek= 50 Joule
ditanya
m= ...?
jawab
Ek= 1/2.mv²
50= 1/2.m(5)²
100= 25 m
m= 100/25
m= 4 kg
50 = 1/2.m.5²
50 = 1/2.m.25
50 = 12,5.m
m = 50/12,5
m = 4 kg