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m = 4 kg
g = 10 m/s²
h2 = 6 meter
ditanya: h1 ?
dijawab:
Ep2 = m . g . h2
= 4 . 10 . 6
= 240 J
Ek = 1/2 m . v²
= 2 . 100
= 200 J
Ep1 = Ep2 + Ek
= 240 + 200
= 440 J
Ep1 = m . g . h1
440 = 4 . 10 . h1
440 = 40 h
h1 = 440/40
h1 = 11 meter (C)