Question

# A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

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Solution

## Step (1):Given:Applied force, $F=140N$Displacement, $d=15m$Step (2):Statement and expression for Work (W):Work is said to be done when a force applied to an object moves that object.The expression for work done by the bullocks is,$Workdone=Force×Displacement$Step (3):Substituting the given values in the expression for Work done (W):$W=F×d\phantom{\rule{0ex}{0ex}}W=140×15\phantom{\rule{0ex}{0ex}}W=2100J$Hence, 2100 J of work is done in ploughing the length of the field.

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