Two boats A and B can each travel at 4 m/s relative to a stream. At a certain moment they are 1.2 km apart with A going down stream and B upstream. The stream is flowing at 2 m/s. How far apart are they 20 s before they cross each other. If the engine of boat B were to fail at the moment the boats cross and the boat B were to travel with the stream, find the distance between the boats 30 s after the crossing.

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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