I kgow astronaut orbiting around Earth feels weightlessness as he/she is in free fall.According to Newton's law of gravitation the gravitational force is everywhere.now my question is will Astronaut feel weightlessness if they will be moving in a straight line in a spaceship and not orbiting around earth. suppose that they are going to the Mars or any other planet outside of solar system will they feel weightlessness?

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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