A 2 kg stone at the end of a string 1 m long is whirled in a vertical circle at a constant

speed. The speed of the stone is 4 m/sec. The tension in the string will be 52 N, when the

stone is

(a) At the top of the circle

(b) At the bottom of the circle

(c) Halfway down

(d) None of the above

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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