At the initial moment three points A ,B and C are on a horizontal straight line at equal distances from one another. Point A begins to move vertically upward with constant velocity v and. C vertically downward without any initial velocity at constant acceleration a .Assuming the points begin to move simultaneously , then for all the points to be constantly on one straight line ,the point B moves with :

1. Acceleration a by 2 An initial velocity v/2 both upwards

2. Retardation a / 2 and initial velocity v / 2both upwards

3. Zero acceleration and initial velocity v

4. Acceleration a/ 2 and initial velocity v both downwards

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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