Question

answer this two questions friends ..

Answer 1

Let's observe the motion of the stone from the frame of trolley car
Since the trolley isn't accelerating.
The time of flight will be

y = vt - 1/2*g*t^2
and since y is zero atlast after the parabolic motion of the stone.
1/2*g*t^2 = vt
Therefore,
t = 0 and t = 2v/g

Time of flight = 2v/g


The horizontal range will be
Range = u*time = u*2v/g = 2uv/g