A projectile is fired horizontally from a height of 10 m above level ground. The projectile lands a horizontal distance of 15 m from where it was launched. a)Find the hang time for the projectile.
b)Find the initial speed of a projectile.
c)What are the x and y components of the projectile's velocity the moment before it strikes the ground?
d)At what speed will the projectile strike the ground?
I found ''a'' 1.43 s
b)10.5 m/s
c)vx answer not given, vy = -14 m/s
d)17.5 m/s

these are the answers I just need to know-how