You slowly lift a bowling ball from the floor and put it on a table. Two forces act on the ball: its weight, of magnitude, mg, and your upward force, also of magnitude mg. These two forces add to zero so that it would seem that no work is done. On the other hand, you know that you have done some work. What is wrong?

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.

11

21

31

41