[tex]F = m\cdot g\\g = 10\frac{N}{kg}\\\\a)\\m = 5 \ kg\\\\F = 5 \ kg\cdot10\frac{N}{kg} = 50 \ N\\\\b)\\m = 25 \ dag = 0,25 \ kg\\\\F = 0,25 \ kg\cdot10\frac{N}{kg} = 2,5 \ N\\\\c)\\m = 7 \ g = 0,007 \ kg\\\\F = 0,007 \ kg\cdot10\frac{N}{kg} = 0,07 \ N\\\\d)\\m = 3 \ t = 3 \ 000 \ kg\\\\F = 3000 \ kg\cdot\frac{N}{kg} = 30 \ 000 \ N=30 \ kN\\\\(1 \ kN = 1000 \ N)[/tex]
