A rat and a horse are to be projected from earth into space. State whether the velocity is the same or different in projecting each animal. Justify.

For a particle to leave from the earth's field, it should be projected with a minimum velocity. An elephant and an ant are to be projected from earth into space. Whether the velocities required for doing so are the same or different? Justify your answer.

State whether the following set is finite or infinite The set of animals living on the earth