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Asseration : A block of mass m starts mo...

Asseration : A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a ceratin distance. The surface is now tilted to an angle of `30^@` with the horizontal and same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is small than the first situation.
Reason : The coefficient of friction between the block and the surface decreases with the increase in the angle of inclination.

A

If both A and R are true and R is the correct explanation of A .

B

If both A and R are true but R is not correct explanation of A .

C

If A is false but R is false .

D

If A is false but R is true

Text Solution

Verified by Experts

The correct Answer is:
C
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These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c ) If Assertion is true but Reason is false. (d) If Assertion is false but Reason is true. Assertion A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a certain distance. The surface is now tilted to an angle of 30^(@) with the horizontal and the same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is smaller than that in the first situation. Reason The coefficient of friction between the block and the surface decreases with the increase in the anglle of inclination.

In the following questions, each question contains Statement I(assertion) and StatementII(reason). Each questions has four choices a, b, c, and d out of which only one is correct. Statement I: A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a certain distance. The surface is now titled to an angle of 30^@ with the horizontal and the same block is made to go up on the surface with the same initial velocity v. The decrease in mechanical energy in the second situation is smaller than that in the first situation. Statement II: The coefficient of friction between the block and the surface decreases with the increase in the angel of inclination.

Statement - 1 : A block of mass m starts moving an a rough horizental surface with x velocity x it step dus to friction between the block and the surface is now tihed in an angles a cormin distance . The surface is now tilted is an angle on the 30^(@) with the inrizonal and the same block is to go up on the surface with the same inital velocity x .THe decrease in the mechanical energy is the second situation is smailar then the that the first situation Statment -2 : The coeifficient of friction between the block and the surface dicreases with the increses in the angle of inclimation .

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