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(A) : On the rough horizontal surface if...

(A) : On the rough horizontal surface if the external force is doubled then the acceleration also becomes more than doubled
(R ) : For a small velocities sliding friction between a body and surface is constant

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the

C

(A) is true but ( R) is false

D

Both (A) and (R ) are false

Text Solution

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The correct Answer is:
A
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A block of mass 10kg pushed by a force F on a horizontal rough plane moves with an acceleration of 5ms^(-2) . When force is doubled, its acceleration becomes 18 ms^(-2) Find the coefficient of friction between the block and rough horizontal plane. (g = 10 ms^(-2)) .