Plz solve question (Full question see in image)

Two particle A and B are moving towards each other on a straight line with equal speeds 5 m/s. At an instant that is assumed t = 0 s, distance between the particles is 100 m. It is desired to move another particle C always maintaining a distance 40 m from the particle A and 30 m from the particle B.

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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