Question

Block A of mass m and block B of mass 2m are placed on a fixed triangular wedge by means of a massless, inextensible string and a frictionless pulley as shown in the figure. The wedge is inclined at 45° to the horizontal on both sides. If the coefficient of friction between block A and the wedge is (2)/(3) and that between block B and the wedge is (1)/(3), and both blocks A and B are released from rest, the acceleration of A will be: 

• A. \( -1\,\text{m s}^{-2} \)
• B. \( 1.2\,\text{m s}^{-2} \)
• C. \( 0.2\,\text{m s}^{-2} \)
• D. zero

Hint:

In pulley–incline systems, always compare net driving forces on both sides before assuming motion.

Answer 1

The Correct Option is D