Question

A block of mass 1 kg travels down a smooth track. If the block starts slipping
on the track from a point Im above the horizontal surface. It will move a distance
5m on the rough horizontal surface and stop. Then friction coefficient of rough
surface is :
(A) 0.20
(B) 0.5
(D) 0.30
(C) 0.1​

Answer 1

Answer:

Let the velocity at point B be V.

By conservation of energy, mgh=  

2

1

​  

mv  

2

⇒v=  

2gh

​  

.

Now deceleration due to friction is a=μg=0.2g.

So stopping distance, s=  

2a

v  

2

 

​  

=2gh/0.4g=5h=5×1=5m

Explanation:

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