A solid sphere ,a hollow sphere and a disc,all having same mass and radius are placed on the top of an inclined plane and released .the friction coefficients between the objects and the incline are same and not sufficient to allow pure rolling.the smallest kinetic energy at the bottom of the incline will be achieved by

1)solid sphere

2) hollow sphere

3)disc

4) all will achieve same kinetic energy

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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