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W= perubahan energi kinetik
W= w sin - fk. X s
F x s= ek
(Mg sin- mk mg cos) s= 1/2 mv2
Coret m nya
(10 x 3/5 - 0.4 x 10 x 4/5) x 10 = 1/2 v kuadrt
2.8 x 10 x 2 = v kuadrt
V=2 akar 14 m/s