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50 = 1/2 x 4 x V x V
50 = 2 x V x V
50/2 = V x V
25 = V x V
V = √25 = 5
Ek= 50 Joule
v =...?
jawab:
Ek = 1/2mv²
50 = 1/2(4)(v)²
50 = 2v²
v² =50/2
v² = 25
v = √25
v = 5 m/s