Chapter 4 - Plug and Chug - Page 69: 38

25 N. 5.5 pounds.

This is discussed on pages 61-62. Part a: $$Weight = (2.5 kg)(10 N/kg) = 25 N$$ Part b: On page 62, we learn that one kilogram weighs 2.2 pounds. $$\frac{1 kg}{2.2 pound} = \frac{2.5 kg}{x}$$ $$x = 5.5 pounds$$