A block of mass "4kg" lies over a horizontal surface `(g=10ms^(-2) )`.Another block of mass "2kg" is placed over the first block. The normal reaction between the first block and ground surface is

A block of mass 1 kg is placed on a horizontal surface . The reaction force to the weight of the block is

A large slab of mass 5kg lies on a smooth horizontal surface, with a block of mass 4kg lying on the top of it. The coefficient of friction between the block and the slab is 0.25 . If the block is pulled horizontally by a force of F =6N , the work done by the force of friction on the slab, between the instants t=2s and t=3s , is (g=10ms^-2)

A block A of mass 2 kg is placed over smooth block B of mass 4 kg which is placed over a smooth horizontal floor The coefficient of friction between A and B is 0.4 when a horizontal forces of magnitude 10 N is applied on A the acceleration of block of A and B are

Figure shows two block system, 4 kg block rests on a smooth horizontal surface, upper surface of 4 kg is rough. A block of mass 2 kg is placed on its upper surface. The acceleration of upper block with respect to earth when 4 kg mass is pulled by a force of 30 N, is

A block A of mass 2 kg rests on a horizontal surface. Another block B of mass 1 kg moving at a speed of m/s when at a distance of 16 cm from A. collides elastically with A. The coefficeint of friction between the horizontal surface and earth of the blocks is 0.2. Then (g = 10 m//s^(2))

A block of mass 8 kg is sliding on a surface inclined at an angle of 45^(@) with the horizontal. Calculate the acceleration of the block. The coefficient of friction between the block and surface is 0.6. (Take g=10m//s^(2) )

A block of mass 10 kg is placed on a horizontal surface as shown in the figure and a force F = 100 N is applied on the block as shown, in the figure. The block is at rest with respect to ground. If the contact force between block and ground is 25n (in Newton) then value of n is : (Take g = 10 m//s^(2))

A block of mass m is placed on another block of mass M which itself is lying on a horizontal surface .The coefficient of friction between two blocks is mu_(1) and that between the block of mass M and horizontal surfece is mu_(2) What maximum horizontal force can be applied to the lower block move without separation?

In the arrangement shown, what is the normal reaction the block A ( mass = 5 kg) and ground

A block A slides over an another block B which is placed over a smooth inclined plane as shown in figure . The coefficient of friction between the two blocks A and B is mu . Mass of block B is two times the mass of block A . The acceleration of the centre of mass of two blocks is