A plumb bob of mass 1 kg is hung from the ceiling of a train compartment. The train moves with an acceleration of g/2 up on an inclined plane. If the angle of inclination is 30 degrees. Find the angle made by the string with the normal to the ceiling. Also find the tension in the string. (g=10 m/s.s)

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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