If a box of mass 25 kg is pushed 15 m by a force of ‘F’ N and work done in the process is 480 J. Find F:

Question

Question

This question was previously asked in

RRB ALP Fitter 21 Jan 2019 Official Paper (Shift 2)

Answer 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:

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

EXPLANATION:

Given that:

Mass (m) = 25 kg.

Distance (s) = 15 m.

Work (W) = 480 J.

Using equation:

∴ 480 = F × 15

F = =

Force = 32 N.