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W=20kg*3m*9,81m/s²
W=60*9,81=588,6J
W = F*S
F = Q = m*g
S = h
W = 20kg*10m/s^*3m
W = 200N*3m
W = 600J
s=3m
m=20
W=F*s
F=a*m
F=10*20
F=200
W=200*3
W=600 J