Question

If reaction is R and coefficient of friction is mu what is work done against friction in moving a body by distnace d? ​

Answer 1

Answer:

C. u(mu)Rd

Explanation:

Here we use frictional and work done formula and N is supposed to be R in this question.

Hope u get it...

Answer 2

The force of friction is given by , f=μN

where N is normal reaction .

Here the normal reaction is R.

∴ f = μR

Work done , w= f.s

                       = μRd

The correct answer will be option c.