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F wypadkowa= 20N- 16N= 4N
p=200N=m*g
200N= m* 10
m= 20kg
a= f/m
a= 4N/ 20kg= 0,2 m/s²
t= v/a
t= 3m/s * 0,2 m/s²= 0,6s
Odp: po 0,6s :)