A person sitting in an open car moving at constant velocity throws a ball vertically upwards in air. If effect of air resistance is neglected, the ball-will fall-

When the ball is thrown vertically upward in a car moving at constant velocity, it retains the horizontal velocity of the car (Galilean relativity). The ball and the thrower continue moving forward together at the same speed, so the ball falls back into the thrower's hands. Air resistance would change this outcome, but the problem states it's neglected. This is the same principle that allows passengers to toss objects in a moving train or airplane.