The work done by the tension can be calculated using the formula:

\(\text{Work Done (WD)} = F \cdot d \cdot \cos(\alpha)\)

where:

• \(F = 25 \text{ N}\) (tension in the string)
• \(\alpha = 20^\circ\) (angle with the horizontal)
• \(d\) is the distance traveled by the block

The distance \(d\) can be calculated as:

\(d = \text{speed} \times \text{time} = 2 \times 8 = 16 \text{ m}\)

Substituting the values into the work done formula:

\(\text{WD} = 25 \times 16 \times \cos(20^\circ)\)

Calculating the above expression gives:

\(\text{WD} \approx 376 \text{ J}\)