Question

Three blocks A, B and C of masses 4kg, 2kg and 1kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4kg block, then the contact force between A and B is :

• A. 18 N
• B. 2N
• C. 6 N
• D. 8 N

Answer 1

The correct option is C

6 N

$a=\frac{14}{7}=2m/s^2\therefore 14-N_1=4\times 2N_1=6N$