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Verified answer
W = m g ∆h
(1) W = 2 • 10 • 0,8. = 16 J
(2) W = 2,5 • 10 • 0,8 = 20 J
(3) W = 2 • 10 • 1,25 = 25 J
(4) W = 2,5 • 10 • 1 = 25 J
sistem yang memiliki nilai usaha sama
d. (3) dan (4)