You throw an ice cube with velocity v into a hot gravity free evacuated space.The cube gradually melts into liquid water and then boil to water vapours. (a) is it a system of particles all the times? (b) if so , is it the same system of particles? Does the motion of the centre of mass undergo any abrupt changes ? (d) does the total momentum change?

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