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= 1/2×0,25×40²
= 0,125×1600
= 200 J
v = kecepatan = 40 m/s
Ek = 1/2 x m x v²
= 1/2 x 0,25 x 40²
= 1/2 x 0,25 x 1600
= 0,25 x 800
Ek = 200 J