Someone please answer this question immediately..

A cube of ice of edge 4cm is placed in an empty cylindrical glass of inner diameter 6 cm. Assume that ice melts uniformly from each side so that it always retains cubical shape. Remember that ice is lighter than water. Find the length of the edge of the ice cube at the instant it just leaves contact with the bottom of the glass.

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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