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V=4m/s
F=?
S=10cm=0,1m
Ek=0,5 x 0,4kg x (4m/s)*2
Ek=0,2kg x 16m*2/s*2
Ek= 3,2J
Ek=W
W=F x S/:S
W/S=F
F= 3,2J/0,1m
F=32N