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

Displacement = 20m
Force = 20N

W = FScos90°
= 20×20×1
= 400J

Answer 2

The work done on the body is 400 Joules.

Explanation:

Given that,

Applied force on a body, F = 20 N

Velocity of the body, v = 20 m/s

Time, t = 1 s

We need to find the work done on the body. It is given by the product of force and displacement.

Displacement = velocity × time

Work done on a body is given by :

$W=F\times d$

$W=F\times v\times t$

$W=20\ N\times 20\ m/s\times 1\ s$

W = 400 Joules

So, the work done on the body is 400 Joules. Hence, this is the required solution.

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