tolong bantu ya make cara

F1= 220
F2= 240
Fgesek= -120
m= 800 kg

Fr= 220+240-120 = 340 N
a= F/m = 340/800 = 0,425 N/Kg

1 N/Kg = 1 m/s² = 100 cm/s²
0,425 x 100 = 42,5 cm/s² ( c )