Since the left-hand sides of Eqs. 13-14 and 13-15 look so much like the definition of work in Eqs. 11-1 and 11-14, why not just call it work and move on? What is the advantage of defining work the way that physicists do? Is the same numerical answer arrived at regardless of the definition?

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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