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2014-05-07T21:50:22+07:00
W = p.t
w= 250 watt x 30.60 detik
w = 250 x 1800
w = 450000 j = 450 kj 
2 5 2
2014-05-07T22:08:40+07:00
W = P . t
    = 250 . 1800
    = 450.000 J --> 450 kJ