The following figures show the variation of displacement with time of a particular object.

A velocity - time graph of a body is shown below. The distance covered by the body from 6 second to 9 second is

The ratio of weight of a man in a stationery lift and weight when the lift is moving downward with a uniform acceleration ' $a$ ' is $3: 2$. Then the value of ' $a$ ' is

For a projectile, the maximum height and horizontal range are same. The angle of projection ' $\theta$ ' of the projectile is