The angle of projection with the horizontal in terms of maximum height attained and horizontal range is given by

A body is projected vertically upwards. The times corresponding to height $$h$$, while ascending and while descending are $$t_1$$ and $$t _2$$ , respectively. Then, the velocity of projection is ($$g$$ is acceleration due to gravity)

A particle shows distance-time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point