Record the weight of the wooden block shown in Fig. 3.1. (b) Calculate the mass of the wooden block. (g = 10N/kg) The wooden block is raised to a vertical height of 10m. Calculate the gravitational potential energy gained by the b

The spring balance has major markings at 0 N, 5 N, and 10 N. Between 0 N and 5 N, there are 4 smaller tick marks, dividing the 5 N range into 5 equal intervals. Therefore, each small interval represents $\frac{5 \text{ N}}{5} = 1 \text{ N}$. The pointer is at the second tick mark after 0 N.
The weight of the wooden block is $0 \text{ N} + 2 \times 1 \text{ N} = 2 \text{ N}$.
The weight of the wooden block is $\boxed{\text{2 N}}$.

The relationship between weight ($W$), mass ($m$), and acceleration due to gravity ($g$) is given by:

Given $W = 2 \text{ N}$ (from part a) and $g = 10 \text{ N/kg}$.

The mass of the wooden block is $\boxed{\text{0.2 kg}}$.

The gravitational potential energy ($GPE$) gained is given by:

Given $m = 0.2 \text{ kg}$ (from part b), $g = 10 \text{ N/kg}$, and $h = 10 \text{ m}$.

The gravitational potential energy gained by the block is $\boxed{\text{20 J}}$.