A body of mass 2kg is moving under the influence of a central force whose potential energy is given by U=2r^3 J. If the body is moving in a circular orbit of 5m, its energy will be

a) 625 J

b) 250 J

c) 500 J

d) 125 J

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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