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W=F*s
F=5000 * 10 = 50000 N
t= 1s
s= 20m
W= 50000N* 20m=1000000 J
P= 1000000J : 1s
P=1000000W=1 MW - odp.
2.F= 10000 N
s=2m
t=2s
P=W:t
W=F*s
W= 10000N*2 m = 20000 J
p= 20000 J :2s= 10000W- odp.
Proszę ;)