Two straight tracks AOB and COD meet each other at rt angles at point O.A person walking at a speed 5 km/hr along AOB is at crossing O at 12 o clock noon, another person with speed 5 km/hr walking along COD reaches O at 1:30 pm .

F ind the time when the distance between the two persons is least?

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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