A small child is playing with a ball on level surface. She gives the ball a push to get it rolling, then the ball rolls a short distance before coming to a stop. The ball rolls slows to a stop because

(A) the child stopped pushing it.

(B) speed is proportional to force.

(C) there must have been some force on the ball opposing the direction of motion.

(D) the net force on the ball was zero, so it wanted to remain stationary

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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