" A stone is thrown vertically upward from the edge of a building 300 m high with an initial velocity of 10 m/s. Missing the building on the way down, what is the...

A) Time of flight

B) Velocity of the stone before impact with the ground

I've got

D= 300 m

V0= 10 m/s

A= 9.8 m/s^2

T= ?

V= ?

I don't know the formula without those two variables, any help would be greatly appreciated.