A block of mass 5kg is placed on a rough horizontal surface of a moving compartment .It is seen by an observer sitting inside the compartment ,that A force of 10N is res in horizontal direction to move the box in a direction parallel to the motion of compartment while a force of 20N is res in horizontal direction to move the box in opposite direction .Find the coefficient of friction bet the surface of the block and the surface.

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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