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
2 N
6 N
8 N
18 N
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A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30ยบ, the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank will be, respectively