Jawabanmu

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2014-05-07T20:00:44+07:00
Rumus :
W= F x S
W = m.g x S

g= gravitasi (10m/s kuadrat)

m.g = W/S
m.10= 2100/3
m.10= 700
m=700/10
m= 70 kg
1 5 1
2014-05-08T00:27:39+07:00
M=EP/gxh
=2.100/10x3
=2.100/30
=70 kg.