thanks for ur prompt reply to my earlier question, I have another one now

Q: A load W is to be raised by a rope from rest to rest thro' a height h: the greatest tensionwhcih the rope can safely bear is nW. Show that the least time in which the ascent can be made is

{2nh/(n-1).g}^1/2

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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