Final answer:
The work done in ploughing the length of the field by a pair of bullocks is calculated using the formula Work = Force × Distance, which results in 2100 J of work done.
option a is the correct
Step-by-step explanation:
To calculate the work done in ploughing the length of the field by a pair of bullocks, we use the formula for work, which is the product of force and distance when the force is applied in the direction of the displacement. The formula is:
Work = Force × Distance
Given the force exerted by the pair of bullocks is 140 N and the field is 15 meters long, the work done is calculated as follows:
Work = 140 N × 15 m
Work = 2100 J
Therefore, the correct answer is (a) 2100 J of work is done in ploughing the length of the field.