Chapter 9

NCERT
Class 9
Science
Solutions
4. 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?

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?

Answer:

Given:

Force (F) = 140N

Displacement (s) = 15m

Work done = Force × displacement

W = F × s

W =140N × 15m

    = 2100Nm

W = 2100 J

Therefore the work done = 2100J.

Buy Latest Books

Teacher's Corner