Consider Sample Problem 7-6. The inner ball is released and rolls around inside the spherical shell for some time be- fore coming to rest. During this time the center of mass

(A) moves both horizontally and vertically.

(B) moves both horizontally and vertically, but returns to the original horizontal position when the system comes to rest.

(C) moves only vertically.

(D) moves vertically only downward, because the center of mass can never move upward.

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