6.A man can thrown a stone 100 m away. The maximum height to which he can throw vertically is

7.If a number of particles are projected from the same point in the same plane so as to describe equal parabolas, then the vertices of their path lie on a:

8.If the height attained by a projectile is the greatest, then which of the following is the maximum ?

9.At the top of the trajectory of a projectile, the directions of its velocity and acceleration are:

10.A particle is projected from horizontal making an angle 60 degree with initial velocity 40 m/s. The time taken by the particle to make angle 45 degree from horizontal, is: