Having seen a big stone falling from the top of a tower Rabi pulled his friend Kiran away. The stone hits Kiran slightly and he got a little hurt . But he was saved from a major accident. What made Rabi act in such a way?

Explanation

Rabi.s first observation that the heavy object was falling freely from the top of the tower and then registering in his brain of the danger of the object hitting his friend Kiran-these are the reasons that made Ravi to act so quickly. Fortunately, his reaction time was just low enough to save Kiran. In this case the reaction time (`tau`) is equal to the time of flight (t) of the object in a free fall from the height (h) of the top of the tower. So Ravi.s reaction time can be estimated from the knowledge of h.