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Question

A force of 6 N is exerted on an object, resulting in its displacement of 2 m in the direction of the force. If the force is constant during the displacement, what is the work done in this case?

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

12 J

The work done by a constant force is calculated using the formula:

\(W = F \cdot d \cdot \cos(\theta)\)

where:

  • \(W\) is the work done (in Joules)
  • \(F\) is the magnitude of the force (in Newtons)
  • \(d\) is the magnitude of the displacement (in meters)
  • \(\theta\) is the angle between the force and the displacement vectors

In this problem, we are given:

  • \(F = 6 \, \text{N}\)
  • \(d = 2 \, \text{m}\)
  • \(\theta = 0^\circ\) (since the displacement is in the direction of the force)

Substituting these values into the formula, we get:

\(W = 6 \, \text{N} \cdot 2 \, \text{m} \cdot \cos(0^\circ)\)

\(W = 12 \, \text{J}\)

Therefore, the work done is 12 Joules.

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