The verical of point above the ground is twice that of Q. A particle is projected downward with a speed of `5 ms^(-1)` from P and at the same time another particle is projected upward with the same speed from W. Both particle reach the ground simultaneously, then

Options

A. PQ = 30 m
B. time of flight of stones = 3 s
C. Both (a) and (b) are correct
D. Both (a) and (b) are wrong

Answer

C

Explanation

`-h=5t-5t^(2)` and `-2h=-5t-5t^(2)`

From these two equations we get, t = 3 s and h = distance between P and Q = 30 m.