Q.

Assertion (A): Work done by friction is always negative 
Reason (R ): When frictional force acts on a body, its kinetic energy may decrease 

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a

A is false but R is true 

b

A is true but R is false 

c

A is true, R is true and R is correct explanation of A 

d

A is true, R is true and R is not correct explanation of A

answer is D.

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Detailed Solution

A is false but R is true 

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