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Three blocks A, B and C of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block then the contact force between A and B is[2015]
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- 6 N
- 8 N
- 18 N
- 2 N
Correct Option: A
| Acceleration of system a = | ||
| MTotal |
| = | = | = 2m/s² | ||
| 4 + 2 + 1 | 7 |
The contact force between A and B
= (mB + mC) × a = (2 + 1) × 2 = 6N
