A block placed on a smooth horizontal floor is connected to a spring as shown. Initially an external f orce of 100N keeps it stretched by 1 cm beyond natural lenght in equilibrium. The force is now removed and another force and another force F is applied on this block,which slowly moves it from this position to a position where the spring is finally compressed by 3 cm. Find the work done by this force F(in joules)

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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