Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

A body of mass m moves with the velocity v on a surface whose friction co-efficient is x . If the

body covers distance s before coming to rest, then v will be
(A) square root of 2xgs (B)square root of xgs
(C) square root of xgs/2
(D) square root of 3xgs



This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
2 a s =  v² - u²        =>       v² =  - 2 a s

     friction force = f =  m a = - x m g
       a = - x g

   v = √(2 x g s)
Kinetic energy of the body = 1/2 * m * v² 
Work done by friction when it stops the body = Force * distance = (μ m g) * (- s)

work done by friction = - initial kinetic energy + final kinetic energy
          - μ m g s =  0 - 1/2 m v²
       v² = 2 μ g s
                           v = √2μgs

1 5 1
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts