The following four wires are made of the same material Which of these will have the largest extension when the same tension is applied?

(a) length = 50 cm, diameter = 0.5 mm

(b) length = 100 cm, diameter = 1 mm

(c) length = 200 cm, diameter = 2 mm

(d) length = 300 cm, diameter = 3 mm.

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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