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Questions  

A body having kinetic energy K moving on a rough horizontal surface is stopped in a distance x. The force of friction exerted on the body is

a
K/x
b
K/x
c
K/x
d
Kx

detailed solution

Correct option is B

Let f be the force of friction and m, the mass of the body.∴ Retardation a=f/mLet v be the initial velocity of the body, thenv2=2ax  or  12mv2=maxor K = fx   (∵ma=f)∴ f=K/x.

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A skier starts from rest at point A and slides down the hill without turning or breaking. The friction coefficient is μ. When he stops at point B, his horizontal displacement is s. What is the height difference between points A and B

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