Question

A stone falls from rest from the top of a high tower.Ignore the air resistance and take g=10/s2. How far has it fallen after 2s

Answer 1

Explanation:

Let’s visualize this without writing any equations. As g is constant, the velocity increases uniformly; that is, the graph of velocity versus time is a straight line. The velocity is zero when the time is zero (because the stone falls from rest). The velocity increases by 10m/s every second, which means it is 10m/s after the first second. Because the graph of velocity is a straight line, the average velocity during the first second is half the final velocity, or 5m/s. Therefore the stone has fallen 5 meters after 1 second.