A boy having a mass of 60 kg and a girl having a mass of 50 kg stand motionless at the end of a boat which has a mass of 30 kg as shown in the figure(figure has been attached). If they exchange their positions at the same time, determine the final position of boat. Neglect friction.

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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