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F=mg
F=2kg*10 m//s2=20N
s=1,5m
W=20N*1,5m=30J
b)P=W//t
t=5
W=30J
P=30J//5s=6W
W = mgh
W = 2*10*1,5
W = 30 J
P = W/t
P = 30/5
P = 6 W