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 four responses
Assertion In the figure shown, block of mass m is stationary with respect to lift. Force of friction acting on the block is greater than `mg sin theta`.
Reason If lift moves with constant velocity, then force of friction is equal to `mg sin theta`

Answer

B

Explanation

(b) `f-mg sin theta=ma sin theta`

`therefore " " f=m(g+a)sin theta gt mg sin theta`