Question

Assertion (A): Work done by frictional force on a moving object is negative.
Reason(R): The frictional force and displacement are opposite in direction.
a) Both A and R are true and R is correct explanation of the assertion.
b) Both A and R are true but R is not the correct explanation of the assertion.
c) A is true but R is false.
d) A is false but R is true.

Answer 1

Answer:

B) is your answer

Explanation:

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Answer 2

Answer:

a

Explanation:

W= F.S=FS cos theta

here theta is 180degree so W is negative