Two particle A and B projected along different directions from the same point P on the ground with the same velocity of 70 m/s in the same vertical plane. They hit the ground at the same point Q such that PQ = 480,. Then `[g=9.8 m//s^(2)]`

Options

A. ratio of their times of flights is `4 : 5`
B. ratio of their maximum heights is `9 : 16`
C. ratio of their minimum speed during flights is `4 : 3`
D. the bisector of the angle between their direction of projection makes `45^(@)` with horizontal

Answer

A, D

Explanation

W = 9.8 N
Normal reaction `N = 10N " " therefore N gt w` there is upward acceleration