Which of the following statements is/are true? (1) When a coolie goes upstairs with a load on his head, work is said to be done. (2) A vehicle moving on a circular path experiences centrifugal force. (3) If a boy sitting in a railway train, moving at constant velocity, throws a ball straight up into the air, the ball will fall in front of him.

(1) Statement (1) is correct. When a coolie goes upstairs with a load on his head, work is done against the force of gravity. (2) Statement (2) is wrong. A vehicle moving on a circular path experiences centripetal force. (3) Statement (3) is wrong. If a boy sitting in a railway train, moving at constant velocity, throws a ball straight up into the air, the ball will fall into his hand.