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```
Two masses A and B of 10 kg and 5 kg resp are connected as shown.The coeff of friction of A with table is 0.2. Find the min mass of C that may be placed on A to prevent it from moving.```
8 years ago

Pratham Ashish
17 Points
```										hi,

let the boxes are not moving ,
in this case, for block b  you can write,

5g - T = 0

let the mass of block c be x
if the boxes are not moving

friction force on A =  0.2 * ( c + 10) g

for block A ,

T -  friction Force  = 0

T -  0.2 * ( c + 10) g = 0

from eq .(1)..

T = 5g

Eq. 2 becomes,

5g -  0.2 * ( c + 10) g = 0

5g - 0.2 c g - 2 g = 0

3g =   0.2 c g

c = 15 kg

```
8 years ago
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