Assertion: All surfaces shown in figure are smooth. System is released from rest. Momentum of system in horizontal direction is constant but overall momentum is not constant.

Reason: A net vertically upward force is acting on the system.

Options

A. (a) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C. (c) If Assertion is true, but the Reason is false.
D. (d) If Assertion is false but the Reason is true.

Answer

C

Explanation

Of the two masses A and B, mass A is moving downwards. Therefore net force on the system is vertically downwards and momentum is not conserved in vertical direction.