Jawabanmu

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2014-06-12T13:30:09+07:00
M= EP
     gxh
m= 200j
    10m/s x 5m
m= 200j  = 40 
     50
 

1 5 1
2014-06-12T15:11:40+07:00
M=Ep/(gxh)
=200/(10x5)
=200/50
=4 kg.