A horizontal force of 20 N is applied on the block of mass 4 kg on the rough horizontal table. If the block does not slip of the table, how much frictional force the table is applying on the block? What can be said about the coefficient of static friction between the block and the table? (g= 10m/s2 )

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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