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 block of mass 2kg is placed on the surface of trolley of mass 20kg which is on a smooth surface.The coefficient of friction between the block and the surface of the trolley is 0.25 .If a horizontal force of 2 N acts on the block, the acceleration of the system in ms^(-2) 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 small, light pulley is attached with a block C of mass 4 kg as shown in fig A block B of mass 1.5kg is placed on the top horizontal surface of C. Another block A of mass 2 kg is hanging from a string, attached with B and passing over the pulley. Taking g=10 ms^(-2) and neglecting friction, acceleration of block C when the system is released from rest is x//4 calculate x.

Block A of mass 5 kg is resting on a frictionless floor. Another block B of mass 7kg is resting on it as shown in the figure. The coefficient of friction between the blocks is 0.5 while kinetic friction is 0.4. If a force of 100 N is applied to block B, the acceleration of the block A will be ( g =10 ms^(-2)) :