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20 = k . 0,04
500 = k
Ep = 1/2 k . x²
= 1/2 . 500 . (0,04)²
= 0,4 joule
*mohon koreksi
^_^
ep= 2kg. 10 m/s2. 4 cm=0.04m
ep= 0,8 joule