Chapter 5 - Force and Motion - Exercises and Problems - Page 128: 13

(a) $a = 2~m/s^2$ (b) $a = 4~m/s^2$

The mass of the object is 0.500 kg. So, (a) $F = ma$ $a = \frac{F}{m}$ $a = \frac{1~N}{0.500~kg}$ $a = 2~m/s^2$ (b) $F = ma$ $a = \frac{F}{m}$ $a = \frac{2~N}{0.500~kg}$ $a = 4~m/s^2$