question_answer

A ball is thrown horizontally and at the same time another ball is dropped down from the top of a tower (i) will both the balls reach the ground at the  time? (ii) Will both strike the ground with the same velocity?

Answer:

                (i)Yes, because the initial vertical velocity of both the balls is zero, and both will cover the same vertical distance under the same vertical acceleration g. (ii)No, because on striking the ground although their vertical velocities will be same but horizontal velocities will be different. Hence their resultant velocities will be different.