Two blocks of equal mass 2 kg are placed on a rough horizontally surfaces as shown and a force F is applied on the upper block . The system is initially at rest . Find acceleration of the lower block in `m// s^(2)` .

Options

A. `3 m//s^(2)`
B. `5 m// s^(2)`
C. Zero
D. none of these

Answer

B

Explanation

Both blocks will have common acceleration
`a_(c)=(25-5)/4=5m//sec^(2)`
[Friction on lower block, `f=muN=(1)/10xx50=5N]`