Question

Work done by an applied force of 20N on a body moving on a rough horizontal plane with a uniform velocity 20m/s in one second is.

Answer 1

Force =20N
Velocity=20 m/s
Time =1 s
Displacement=V xt
=20m
Work =F x Displacement
=20 x20
=400J

Answer 2

Power= ForcexVelocity

=20x20

=400W.

Now,

Work done= PowerxTime

=400x1

=400J.