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* Mencari percepatan
a = v/t
a = 10/5
a = 2 m/s²
* Mencari gaya gesek
∑F = ma
F - fk = ma
100 - fk = 25 . 2
100 - fk = 50
fk = 100 - 50
fk = 50 Newton
Jadi, gaya gesekan kinetiknya adalah 50 Newton