Four solid objects, each with the same mass and radius, are spinning freely with the same angular speed. Which object requires the most work to stop it?

(A) A solid sphere spinning about a diameter

(B) A hollow sphere spinning about a diameter

(C) A solid disk spinning about an axis perpendicular to the plane of the disk and through the center.

(D) A hoop spinning about an axis along a diameter

(E) The work required is the same for all four objects.

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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