In the arrangement shown in the figure the coefficient of friction between the blocks C and D is `mu_(1) = 0.7` and that between block D and the horizontal table is `mu_(2) = 0.2`. The system is released from rest. [ Take `g = 10 ms^(–2)`] Pulleys and threads are massless.

(a) Find the acceleration of the block C.
(b) Block B is replaced with a new block. What shall be the minimum mass of this new block so that block C and D accelerate in opposite direction?

Answer

(a) `2ms^(-1)`
(b) 2.1 kg