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5 N= 0,5. 2 kg. a
a= 0,25 m/s2
a= F-f/m
a= F- uN/m
a= F- u.m.g/m
a= (5- 0,5.2.10)/2
a= (5-10)/2
a= -5/2=-2,5 m/s² (- menunjukkan perlambatan) (A)