A bright point object is kept at some distance from a lens of focal length 20 cm. If the object distance ischanged 5/6 times, the distance of the screen from the lens has to be changed by 5/3 times to obtain aclear image on the screen. Find the distance through which the screen has been moved.

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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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