A pendulum bob of mass m hangs from a massles elastic string. The potential energy (elastic+gravitational) of the system (bob+string+ Earth) measured realtive to the position of the of the bob corresponding to the normal length of the string is(where x= static deformation (elongation) of the string)

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.

11

21

31

41