Question

a mass of 2 kg rest on an incline of 1 :8 . work done in moving it from bottom to top when the coefficient of friction is 0.2 can be

Answer 1

Here’s the procedure:

First determine the acceleration using Newton’s second law (F=ma)
Then use Newton’s equations of motion to determine time of travel, distance travelled, etc.

Answer 2

Answer:

From FBD,  

F=mgsinθ+f

or F=mg  

x

h

​  

+f     as(sinθ=  

x

h

​  

)

or Fx=mgh+fx

or W  

F

​  

=mgh+W  

f

​  

      as work done = force × distance.

150=5×10×2+W  

f

​  

 

or W  

f

​  

=150−100=50J