A stone is thrown upward from the top of a tower with some initial speed and it reaches the ground in t1 seconds. Another stone is thrown with the same initial speed downwards and it reaches the ground in t2 seconds. In how much time a stone will reach the ground if the stne is released and allowed to fall freely under gravity from the saame place.

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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