In the following arrangement, the system is initially at rest. The 5-kg block is now released. Assuming the pulley and string to be massless and smooth, the acceleration of block C will be

Options

A. zero
B. `2.5ms^(-2)`
C. `10//7ms^(-2)`
D. `5//7ms^(-2)`

Answer

B

Explanation

For `A: 5g-T=5(2C)`
for `C: 2T - 8 g = 8C implies C-(8)/(14) = 5/7 ms^(-2)`.