A boy aims a gun at a bird from a point, at a horizontal distance of `100m`. If the gun can impart a velocity of `500m//sec` to the bullet, at what height above the bird must he aim his gun in order to hit it?

Explanation

`x=vt" or "100=500xxt" ", t=0.2sec`
Now `h=0+(1)/(2)xx10(0.2)^(2)=0.20m=20cm`