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1. a = f/m
a = 400 N/ 20 kg
a = 20 m/s2
2. a = f/m
a = 15 N/500 kg
a = 0.03 m/s2
4. F = m*a 100g*1kg/1000g = 0.1 kg
F = 0.1 kg * 200 m/s2
F = 20 N
5. m = F/a 1000cm*1m/100cm = 10m
m = 100 N/10 m/s2
m = 10 kg