Question

A load of 16.5 kg is lifted through a height of 3.4 metres. Find the work done in kg metre.
1. 60.2
2. 56.8
3. 56.1
4. 56.6

Answer 1

Correct Answer - Option 3 : 56.1

Concept:

• Work: Work is said to be done by a force when the body is displaced actually through some distance in the direction of the applied force.
• Since the body is being displaced in the direction of F, therefore work done by the force in displacing the body through a distance s is given by:

\(W = \vec F \cdot \vec s\)

• Thus work done by a force is equal to the scalar or dot product of the force and the displacement of the body.

Calculation:

Given:

m = 16.5 kg, s = 3.4 m

W = 16.5 × 3.4

W = 56.1 kg-m